KR100759492B1 - Apparatus for recording/reproducing of optical information, method for recording/reproducing of optical information and optical information storage medium - Google Patents

Abstract

An apparatus and a method for recording and reproducing optical information and an optical information storage medium are provided to dispose the first optical system which records optical information on the storage medium, the second optical system which reads out a reproduction beam from the storage medium, and a reproduction beam detector. A beam source(110) generates a beam. The first optical splitter(120) splits the beam into a pair of first and second beams. The second optical splitter(130) splits the second beam into a signal beam and a reference beam. A signal beam optical system(150) contains data in the signal beam and irradiates the signal beam into a storage medium. A reference beam optical system(160) irradiates the reference beam for reproduction into the storage medium. A detector(170) reads out a readout beam, which is reproduced by the reference beam for reproduction, from the storage medium in which optical information is stored while the reference beam and the signal beam are being transmitted, and the readout beam is formed in a transmission direction of the signal beam.

Description

Optical information recording and reproducing apparatus, optical information recording and reproducing method and optical information storage medium {Apparatus for recording / reproducing of optical information, method for recording / reproducing of optical information and optical information storage medium}

1 is a block diagram showing the configuration of an optical information recording and reproducing apparatus according to the present invention.

2 is a conceptual diagram showing recording of optical information in the optical information recording and reproducing apparatus according to the present invention.

3 is a conceptual diagram showing reproduction of optical information in the optical information recording and reproducing apparatus according to the present invention.

4 is a flowchart showing a method of reproducing optical information in the recording and reproducing apparatus according to the present invention.

** Description of the symbols for the main parts of the drawings **

100: optical information recording and reproducing apparatus

110: light source

120: first optical splitter

130: second light splitter

140: reproduction light optical system for recording

150: signal light optical system

160: reference light optical system for reproduction

170: detector

The present invention relates to an optical information recording and reproducing apparatus, an optical information recording and reproducing method, and an optical information storage medium, and more particularly, to record and reproduce optical information on a storage medium having a reflective surface that reflects incident light. An optical information recording and reproducing apparatus, an optical information recording and reproducing method, and an optical information storage medium.

Optical data processing apparatuses include Digital Versatile Disc (DVD), HD-DVD, Blu-ray Disc (BD), near field light processing apparatus, holographic light processing apparatus, and the like.

The holographic light processing apparatus receives an optical modulated signal beam and a reference beam that intersects the signal light to form an interference fringe on the storage medium, and stores the data. In the reproduction of data, only the reference light is incident on the hologram of the storage medium so that data input to the storage medium is output by diffraction generated in the hologram.

In order to increase the recording capacity, the holographic optical information processing apparatus may store data in a multiplex by irradiating a reference light to one beam spot at different angles. The multi-input data can be output by irradiating only the reference light at different angles during reproduction. In other words, the holographic light processing device is a supercapacitive data storage device capable of inputting and outputting data in a multi-layered and overlapping state at one light spot.

In the holographic optical information processing apparatus, a method of multiplexing light is used to increase the recording density of data. Methods of multiplexing light include angular multiplexing, phase-code multiplexing, wavelength multiplexing, and shift multiplexing.

Here, the angular multiplexing method is to multiplex by changing the incident angle of the reference light, the phase code multiplexing is to multiplex by modulating the phase spatially, the wavelength multiplexing is to multiplex according to the wavelength change using a wavelength tunable laser, the shift multiplexing There is a method of multiplexing records while moving the storage medium.

As mentioned above, the holographic optical information storage device irradiates the reference light and the signal light to the storage medium at different angles, and when regenerating the light, the reference light is incident on the storage medium and diffracted from the storage medium to the opposite side to the optical information detector. Detect and play back data.

The prior art of the holographic optical information storage device is disclosed in US Patent No. 6058232, "Volume holographic data storage system using a beam pattern from a tapered optical fiber," issued to "Byeong Ho Lee". In addition, recently disclosed US Patent Application Publication No. 2005-0007930, "Optical information recording apparatus" filed by "Hideyoshi" and the like.

In order to reproduce the optical information stored in the storage medium as described above, an optical system including a light source for injecting reference light into the storage medium on one side of the storage medium must be provided, and reproduced by the reference light on the other side of the storage medium. A reproducing light detector and an optical system for reading reproducing light to be provided should each be provided.

That is, since the optical system for recording optical information on the storage medium, the optical system for reading the reproduced light reproduced on the storage medium, and the regenerated light detector must be provided independently, the volume of the device itself becomes large, and the structure thereof is complicated. There was a problem with getting lost.

The present invention has been made to solve the above problems, an optical system for recording optical information on the storage medium, an optical system for reading the reproduction light reproduced from the storage medium and the reproduction light detector is provided on one side of the storage medium. It is an object of the present invention to provide an optical information recording and reproducing apparatus, an optical information recording and reproducing method, and an optical information storage medium capable of reducing the volume of the apparatus itself.

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An optical information recording and reproducing apparatus according to the present invention for achieving the above object comprises: a light source for generating light; A first light splitter that separates the light into a pair of first and second lights; A recording reference light optical system for converting the first light to be incident on the storage medium; A second light splitter that separates the second light into a signal light and a reference light for reproduction; A signal light optical system which loads data on the signal light and enters the storage medium; A reproduction reference light optical system for injecting the reproduction reference light into the storage medium; Optical information is stored while the recording reference light and the signal light are transmitted, and the reproduction light reproduced by the reproduction reference light is read from the storage medium in which reproduction light is formed in the projection direction of the signal light while the reproduction reference light is reflected. A detector;

The recording reference light optical system includes: an optical conversion member so that the first light has an optical characteristic for recording optical information; A shielding shutter for blocking the recording reference light when the optical information of the storage medium is reproduced; It is preferable to include a rotating mirror for angularly multiplexing the recording reference light and entering the storage medium.

The light conversion member is preferably provided with an S polarizing plate for polarizing the first light by S polarization.

Preferably, the second light splitter separates the S-polarized component from the second light to form signal light, and separates the P-polarized component from the second light to form a reference light for reproduction.

Preferably, a shielding shutter is further provided on the optical path of the reference light for reproduction to block the optical path of the reference light for reproduction when optical information is recorded on the storage medium.

The signal light optical system includes: a spatial light modulator for loading data into signal light separated from the second light splitter; It is preferable to provide a Fourier transform lens for Fourier transforming the signal light on which data is loaded.

Preferably, a reproducing light splitter is provided between the spatial light modulator and the Fourier transform lens to convert reproducing light, which is reproduced when reproducing optical information of the storage medium, to the detector.

The reproduction reference light optical system includes: a light adjusting member for adjusting an optical characteristic of the reproduction reference light; A shielding shutter for blocking the reproduction reference light when recording the optical information of the storage medium; It is preferable to include a rotating mirror to angularly multiplex the reproduction reference light and enter the storage medium.

The incidence angle of the reproduction reference light incident on the storage medium is preferably set such that the reflection angle of the reproduction reference light reflected when the reproduction reference light is reflected is equal to the incident angle of the recording reference light.

In addition, the optical information reproducing apparatus according to the present invention for achieving the above object, the light source for generating light; Converts the light into a reference light for reproducing optical information, and a reflection angle of the reference light reflected when the reference light is incident on the storage medium and reflected by the storage medium and an incident angle of the reference light incident upon recording the optical information of the storage medium; A reference light optical system for injecting the reference light into the storage medium to be the same; And a detector which reads out the reproduction light formed in the storage medium by the reference light reflected by the reference light incident by the reference light optical system as reflected by the storage medium.

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In addition, the optical information reproducing method according to the present invention for achieving the above object, in the method for reproducing the optical information stored in the storage medium having a storage layer for storing the optical information and a reflective layer for reflecting the incident light Changing the light emitted from the light source into a reference light for reproducing the optical information; Injecting the reference light into the storage medium, the incident light being equal to the incident angle of the reference light incident upon the storage of the optical information when the reference light is reflected by the reflective layer; And reading the reference light reflected by the reflective layer and the reproduction light generated by the optical information stored in the storage layer.

Hereinafter, an optical information recording and reproducing apparatus, an optical information recording and reproducing method, and an optical information storage medium according to the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, the names of the elements defined are defined in consideration of functions in the present invention, and should not be understood as meanings that limit the technical elements of the present invention. May be referred to by other names in the art. In addition, the code added to each component is described for convenience of description, and the contents shown in the drawings in which these codes are described do not limit each component to the range in the drawing. In addition, as long as the functional similarity and identity thereof, even if the modified embodiment is adopted, it can be seen as an equivalent configuration, and even if the embodiment in which the modified part of the configuration is employed, it can be seen as an equivalent configuration.

First, the optical information recording and reproducing apparatus according to the present invention will be described with reference to the accompanying drawings.

1 is a block diagram showing the configuration of an optical information recording and reproducing apparatus according to the present invention.

As shown in the drawing, the optical information recording and reproducing apparatus includes a pair of first and second light sources for generating a light L having a predetermined wavelength and a light L emitted from the light source 110. The reference light optical system 140 for converting the first light splitter 120 separated by L1 and L2 and the first light L1 separated by the first light splitter 120 into the storage medium 200. ), A second light splitter 130 that separates the second light L2 separated from the first light splitter 120 into a signal light S and a reference reference light Rr, and a second light splitter 130. A signal light optical system 150 which loads data into the signal light S separated from the light beam and enters the storage medium 200, and a reproduction reference light Rr separated by the second light splitter 130 into the storage medium 200. And a detector 170 for reading out the reproduction light reproduced by the reproduction reference light Rr incident on the storage medium 200.

On the other hand, the storage medium 200 used in the optical information recording and reproducing apparatus 100 according to the present invention having the above-described configuration includes a storage layer 210 in which a holographic interference fringe is formed and a reference light Rr for reproduction. A reflective layer 230 for reflecting and an intermediate layer 220 provided between the storage layer 210 and the reflective layer 230 to form a reflection path of the reproduction reference light Rr are provided. The storage medium 200 will be described in detail after describing the optical information recording and reproducing apparatus 100 according to the present invention.

The light source 110 generates light L having a predetermined wavelength, and the light L generated by the light source 110 is a parallel light beam, which is a plane wave-type laser light having excellent coherent. It is preferred, for example, to have the wavelength required for holographic data storage.

The first light splitter 120 separates the light L emitted from the light source 110 into first and second lights L1 and L2 having the same optical characteristics. On the optical path of the first light L1 separated by the first light splitter 120, a recording reference light optical system 140 for converting the first light L1 into the storage medium 200 is provided.

The recording reference light optical system 140 includes a light conversion member 142 for converting the first light L1 separated by the first light splitter 120 into a recording reference light Rw for recording optical information; Rotation for switching the optical path of the recording reference light Rw and the shielding shutter 144 to block the recording reference light Rw when the optical information stored in the storage medium 200 is reproduced. A mirror 146.

Here, the light conversion member 142 may be provided as a polarizing plate, a photosensitive filter, etc. for converting the first light (L1) separated from the first light splitter 120, the light conversion member 142 is made of It is preferable that the first polarized light L1 separated by the single light splitter 120 is provided as an S polarizing plate for polarizing S polarized light.

In addition, the rotation mirror 146 is preferably provided with a galvano mirror for adjusting the optical path of the recording reference light Rw and angular multiplexing by the recording reference light Rw.

The second light splitter 130 separates the second light L2 separated by the first light splitter 120 into a reproduction reference light Rr and a signal light S, and has two kinds of different refractive indices. It has a polarization splitting surface which polarizes and splits the 2nd light L2 which injects in the structure which repeatedly deposited the above material. The P-polarized component of the second light L2 incident by the polarization splitting surface is transmitted to become the reproduction reference light Rr, and the S-polarized component is reflected to become the signal light S.

Here, the second light splitter 130 may further include light adjusting members 132R and 132S for adjusting the optical characteristics of the reproducing reference light Rr and the signal light S separated from the second light splitter 130. Can be. The light adjusting members 132R and 132S may be provided as polarizing plates, photosensitive filters, or the like. The light adjusting members 132R and 132S are installed when precise adjustment of the intensity, uniformity, etc. of the reproduction reference light Rr and the signal light S is required, and the characteristics of the reproduction reference light Rr and the signal light S are guaranteed. If not, it may not be installed.

In addition, a shielding shutter 134R for blocking the optical paths of the reproduction reference light Rr and the signal light S is included in the optical paths of the reproduction reference light Rr and the signal light S separated by the second light splitter 130. 134S) are provided respectively. The shielding shutters 134R and 134S block the reproduction reference light Rr when storing the optical information in the storage medium 200, and block the signal light S when reproducing the optical information stored in the storage medium 200.

The signal light optical system 150 loads data into the signal light S separated from the second light splitter 130 and enters the storage medium 200. The signal light S separated from the second light splitter 130 is provided. Spatial Light Modulator (SLM, 152) for loading data into the data, and Fourier transform lens 156 for Fourier transforming the signal light (S) loaded with the data to enter the storage medium 200.

Here, the spatial light modulator 152 is a typical TFT LC (thin film transistor liquid crystal) of the active matrix, super twisted nematic liquid crystal (STN LC) of the passive matrix, ferroelectric liquid crystal (LC), polymer dispersion (PDLC; Polymer) Transmissive spatial light modulators, such as Dispersed Liquid Crystal (PALC) and plasma address liquid crystal (PALC), and reflective spatial light modulators including digital micro-mirror devices (DMDs) and reflective optical systems can be used. have.

On the other hand, a reproduction light splitter 154 is provided between the spatial light modulator 152 and the Fourier transform lens 152 to separate the reproduction light reproduced when the optical information stored in the storage medium 200 is reproduced. The reproduction light splitter 154 passes the signal light S passing through the spatial light modulator 152 at the time of storing the optical information, and detects the reproduction light generated by the reproduction reference light Rr at the time of reproduction of the optical information. Refraction to the side.

The reproducing reference light optical system 160 is for injecting the reproducing reference light Rr of the P polarization component separated by the second light splitter 130 into the storage medium 200, and the view of the reproducing reference light Rr. A reflection mirror 162 for switching the furnace and a rotation mirror 164 for injecting the reproduction reference light Rr whose light path is switched into the storage medium 200 are provided.

The rotation mirror 164 is preferably provided with a galvano mirror for adjusting the optical path of the reproduction reference light Rr and angular multiplexing by the recording reference light Rw.

The detector 170 detects the reproduction light reproduced by the reproduction reference light Rr incident on the storage medium 200, and includes a charge-coupled device (CCD) and a complementary metal-oxide semiconductor (CMOS). An image sensing device having the same pixel array may be adopted.

On the other hand, the storage medium 200 used in the optical information recording and reproducing apparatus 100 according to the present invention having the configuration as described above may be formed in a disk form, and the holographic optical information by angular multiplexing is stored or It can be stored by one recording and playback apparatus 100.

The storage medium 200 includes a storage layer 210 in which a holographic interference fringe is formed by the reference light Rw and the signal light S of the S-polarized component, and the reproduction incident through the storage layer 210. A reflection layer 230 that refracts the reference light beam Rr so as to form reproduction light by the holographic interference fringe, and is provided between the storage layer 210 and the reflective layer 230 to form an optical path of the reference light beam Rr for reproduction. The intermediate layer 220 is provided.

Here, the storage layer 210, the holographic interference pattern is formed by the reference light and the signal light for recording, a kind of photopolymers may be adopted. For example, the storage medium 200 may use DuPont's product name "HRR-660" or Aprilis' product name "ULSH-500", or polymethylmethacrylate (PMMA). have. And other types of photopolymers may be employed.

The reflective layer 230 is provided such that the recording reference light Rw and the signal light S are transmitted, and the reproduction reference light Rr is reflected. That is, the recording reference light Rw which is S-polarized light and the signal light S are transmitted, and the reproduction reference light Rr which is P-polarized light is reflected. The reflective layer 230 may be formed by repeatedly depositing two or more kinds of materials having different refractive indices.

On the other hand, the intermediate layer 220 is provided between the storage layer 210 and the reflective layer 230, the optical path of the reproduction reference light (Rr) reflected by the reflective layer 230 and the optical path of the recording reference light (Rw) The optical path of the reproduction reference light Rr is formed to be the same.

The intermediate layer 220 includes an incident position of the reproduction reference light Rr incident on the storage layer 210 and a reproduction reference light Rr reflected by the reflective layer 230 after passing through the storage layer 210. When the reproduction reference light Rr enters the storage medium 200 because the emission position is different, the reproduction light is not formed, and the reproduction light is formed only after the reproduction reference light Rr is reflected by the reflective layer 230. It was made possible.

Accordingly, the optical information recording and reproducing method of the optical information recording and reproducing apparatus according to the present invention as described above will be described in detail through the embodiment. Each element mentioned below should be understood with reference to the above description and drawings.

2 is a conceptual diagram showing recording of optical information in the optical information recording and reproducing apparatus according to the present invention, FIG. 3 is a conceptual diagram showing reproduction of optical information in the optical information recording and reproducing apparatus according to the present invention, and FIG. Is a flowchart showing a method of reproducing optical information in a recording / reproducing apparatus according to the present invention.

First, the operation of recording optical information will be described with reference to FIG. 2. When the optical information is recorded, the light L emitted as the light L is emitted from the light source 110 is the first and second lights L1 and L2 having the same optical characteristics by the first light splitter 120. Separated by. Here, the separated first light L1 is incident on the recording reference light optical system 140 to be converted into the recording reference light Rw, and the second light L2 is incident on the second light splitter 130 to receive the signal light ( S) and the reproduction reference light Rr.

Here, the first light L1 incident on the recording reference light optical system 140 is converted into S-polarized light by the light converting member 142, and then converted to the recording reference light Rw for storing optical information. The recording reference light Rw is incident on the storage medium 200 by the rotation mirror 146.

On the other hand, the reproduction reference light Rr separated by the second light splitter 130 is blocked by the shielding shutter 134R provided on the optical path of the reproduction reference light Rr. The signal light S separated by the second light splitter 130 passes through the light adjusting member 132S, and its optical characteristics are adjusted to enter the spatial light modulator 152.

In addition, the signal light S incident to the spatial light modulator 152 is loaded with data by the spatial light modulator 152, and the signal light S on which the data is loaded is stored by the Fourier transform lens 156. Incident).

The holographic interference fringe is formed in the storage layer 210 of the storage medium 200 by the recording reference light Rw incident to the same point of the storage medium 200 and the signal light S, and the holographic interference fringe is formed. Becomes optical information data for reproduction of the storage medium.

Meanwhile, the recording reference light Rw and the signal light S, which form the holographic interference fringe, are projected to the outside of the storage medium 200 through the intermediate layer 220 and the reflective layer 230 of the storage medium 200 to be lost. do.

Hereinafter, an operation of reproducing optical information will be described with reference to FIGS. 3 to 4. When the optical information is reproduced, the light L emitted as the light L is emitted from the light source 110 for the reproduction of the optical information is the first and second light having the same optical characteristics by the first optical splitter 120. Separated by (L1, L2).

Here, the separated first light L1 enters the recording reference light optical system 140 and is blocked by the shielding shutter 144 provided on the optical path of the recording reference light Rw. The second light is incident on the second light splitter 130 to be separated into the signal light S and the reproduction reference light Rr (step S110).

Here, the signal light S separated by the second light splitter 130 is blocked by the shielding shutter 132S provided on the light path of the signal light S, and the reference light Rr for reproduction is light controlled. The optical characteristics are adjusted by the member 132R and the optical path is switched by the reflective mirror 162.

Accordingly, the reproduction reference light Rr whose optical path is switched is incident on the storage medium 200 by the rotation mirror 164. At this time, the incident reference light Rr is passed through the storage layer 210 and the intermediate layer 220 of the storage medium 200 and is reflected by the reflective layer 230.

At this time, the incident angle of the reproduction reference light Rr incident on the storage medium 200 is the reflection angle of the reproduction reference light Rr reflected when the reproduction reference light Rr is reflected by the reflective layer 230. Is set equal to the incident angle () (step S120).

That is, the light path of the reproduction reference light Rr reflected by the reflective layer 230 and exiting through the intermediate layer 220 and the storage layer 210 and the view of the reference light Rw incident upon storage of the optical information. The furnace is incident so as to form the same in the state in which the traveling direction of the light is reversed.

Accordingly, the reproduction reference light Rr passes through the holographic interference fringe formed in the storage medium 200. Accordingly, the reproduction light is generated in a direction opposite to the incident direction of the signal light S when the interference fringe is formed in the storage medium 200.

The regenerated light generated at this time is incident on the regenerated light splitter 154 while passing through the Fourier transform lens 156, is refracted by the regenerated light splitter 154 toward the detector 170, and the optical information is read by the detector 170. (Step S130).

Although described in detail with respect to preferred embodiments of the present invention as described above, those of ordinary skill in the art, without departing from the spirit and scope of the invention as defined in the appended claims Various modifications may be made to the invention. Therefore, changes in the future embodiments of the present invention will not be able to escape the technology of the present invention.

For example, in the optical information recording and reproducing apparatus according to the present invention, only the configuration for reproducing the optical information may be performed separately, or only the configuration for recording the optical information may be separately performed.

In addition, the optical information recording and reproducing apparatus according to the present invention may be implemented by adding a component having another additional function or replacing it with another component. However, all other modified embodiments include the essential components of the present invention and the storage medium of the present invention should be considered to be included in the technical scope of the present invention.

As described above, according to the optical information recording and reproducing apparatus, the optical information recording and reproducing method, and the optical information storage medium according to the present invention, an optical system for recording optical information on the storage medium and the read light reproduced from the storage medium are read. The optical system and the reproducing light detector to be provided on one side of the storage medium has the effect of reducing the volume of the device itself.

Claims (15)

delete delete A light source for generating light; A first light splitter that separates the light into a pair of first and second lights; A recording reference light optical system for converting the first light to be incident on the storage medium; A second light splitter that separates the second light into a signal light and a reference light for reproduction; A signal light optical system which loads data on the signal light and enters the storage medium; A reproduction reference light optical system for injecting the reproduction reference light into the storage medium; Optical information is stored while the recording reference light and the signal light are transmitted, and the reproduction light reproduced by the reproduction reference light is read from the storage medium in which reproduction light is formed in the projection direction of the signal light while the reproduction reference light is reflected. And an optical detector for recording and reproducing the optical information. The optical system for recording reference light according to claim 3, An optical conversion member so that the first light has an optical characteristic for recording optical information; A shielding shutter for blocking the recording reference light when the optical information of the storage medium is reproduced; And a rotation mirror which angles the recording reference light and enters the storage medium. The method of claim 4, wherein the light conversion member, And an S polarizing plate for polarizing the first light to S polarized light. The method of claim 3, wherein the second light splitter, And the S-polarized component is separated from the second light to form a signal light, and the P-polarized component is separated from the second light to form a reference light for reproduction. The method of claim 3, wherein And a shielding shutter is further provided on the optical path of the reference light for reproducing to block the optical path of the reference light for reproducing when optical information is recorded on the storage medium. The optical system of claim 3, wherein the signal light optical system is A spatial light modulator for loading data into signal light separated by the second light splitter; And a Fourier transform lens for Fourier transforming the signal light loaded with data. The method of claim 8, And a reproduction light splitter for converting the reproduction light reproduced at the time of reproduction of the optical information of the storage medium to the detector side between the spatial light modulator and the Fourier transform lens. The optical system for reproducing the reference light according to claim 3, A light adjusting member for adjusting an optical characteristic of the reference light for reproduction; A shielding shutter for blocking the reproduction reference light when recording the optical information of the storage medium; And a rotation mirror which angles the reproduction reference light and enters the storage medium. The method of claim 3, wherein And an incidence angle of the reproduction reference light incident on the storage medium is set such that a reflection angle of the reproduction reference light reflected when the reproduction reference light is reflected is equal to an incident angle of the recording reference light. . A light source for generating light; Converts the light into a reference light for reproducing optical information, and the reflection angle of the reference light reflected when the reference light is incident on the storage medium and reflected by the storage medium is the same as the incident angle of the reference light incident upon recording the optical information of the storage medium A reference light optical system for allowing the reference light to enter the storage medium; And a detector for reading out the reproduction light formed in the storage medium by the reference light reflected as the reference light incident by the reference light optical system is reflected by the storage medium. delete delete Claims [1] A method for reproducing optical information stored in a storage medium comprising a storage layer storing optical information and a reflective layer reflecting incident light. Converting light emitted from a light source into reference light for reproducing the optical information; Injecting the reference light into the storage medium, the incident light being equal to the incident angle of the reference light incident upon the storage of the optical information when the reference light is reflected by the reflective layer; And And reading the reference light reflected by the reflective layer and the reproduction light generated by the optical information stored in the storage layer.

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