JP2007018314A - Traffic data measurement system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a traffic data measurement system capable of automating traffic data investigation from input to analysis to improve the efficiency. <P>SOLUTION: A cellular phone 13 photographs images at a measurement point with a camera 23, and compresses vehicle model codes input through a ten-key 25 to store them into itself. In addition, after a certain period passes, the cellular phone 13 transmits the time and location information when the ten-key 25 was depressed to a server 11 through a network 15. The server 11 classifies the data received from the cellular phone 13 for every location, and then analyzes the interval between measurement time to determine the reliability. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a traffic data measurement system using a mobile terminal.

Traditionally, to measure traffic data, there was a standard way to transfer the manual counter counter display to the vehicle type table (paper) according to time of day, and then aggregate it using the input data (for example, [See Non-Patent Document 1].)
Shizuoka National Highway Office, "Data Room Road Traffic Survey" [online], November 9, 2004, Shizuoka National Highway Office, [May 10, 2005 search], Internet <URL: http: // www . shizukoku. go. jp / dataroom / census />

  However, there is a problem that the operation of counting on a counting machine and then transferring to paper is complicated, and it takes time from the time of survey to the completion of counting. In addition, each investigator had to investigate each measurement location and time. Furthermore, the actual working conditions of the investigators could not be grasped, and there was no means for confirming whether or not an accurate survey was conducted.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to automate from input to analysis of a traffic data survey to improve efficiency.

  In order to achieve the above-mentioned object, a first invention is a traffic data measurement system in which a server and a mobile terminal are connected to a network and measures traffic data. The mobile terminal measures a numeric keypad and position information. Position measuring means, time measuring means for measuring time information, position information measured by the position measuring means when a car is counted by the numeric keypad, and time information measured by the time measuring means A traffic data measuring system comprising: a collecting means for collecting the position information; and a holding means for holding the count value counted by the numeric keypad, the position information collected by the collecting means, and the time information. .

The position measuring means for measuring position information is a means for measuring the latitude and longitude at which the mobile terminal is located, for example, a GPS (Global Positioning System) function.
The time measuring means for measuring time information is a watch built in the portable terminal.

  The numeric keypad is assigned to each vehicle type. The portable terminal emits a sound or voice indicating the vehicle type each time the numeric key is pressed. As a result, the operator confirms whether or not the numeric keypad corresponding to the vehicle type has been correctly pressed. Here, the numeric keypad includes keys other than “0” to “9”.

In addition, the portable terminal compresses the position information and the time information at the time when the position information and the time information are acquired, and holds the compressed position information and the time information.
The compression is performed by converting the difference between records having position information and time information into a hexadecimal number.

The second invention is a portable terminal connected to a server via a network, the portable terminal comprising a numeric keypad, position measuring means for measuring position information,
Time measuring means for measuring time information, sampling means for collecting position information measured by the position measuring means and time information measured by the time measuring means when a car is counted by the numeric keypad, and A portable terminal comprising: a count value counted by the numeric keypad; the position information collected by the collection means; and a holding means for holding the time information.

  The third invention is used in a traffic data measuring system for measuring traffic data, and is connected to a mobile terminal via a network, and count values, position information, and time information for counting cars from the mobile terminal are transmitted. And a means for measuring an interval between the time information of the time information sent from the mobile terminal, and a means for determining the reliability by comparing the interval with a threshold value. It is a server characterized by this.

  With the traffic data measurement system of the present invention, it is possible to automate the process from traffic data survey input to analysis to improve efficiency.

  Hereinafter, a traffic data measurement system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram of a traffic data measurement system 1. As shown in FIG. 1, in the traffic data measurement system 1, a server 11 is connected to a mobile phone 13 via a network 15 and a base station 17. The server 11 processes traffic data sent from the mobile phone 13.

  A mobile phone 13 as a mobile terminal is a terminal having position measuring means and time measuring means. The mobile phone 13 counts the cars and sends the counted data to the server 11 via the base station 17 and the network 15. The network 15 is a packet communication network, a LAN, the Internet, or the like.

  Next, the configuration of the mobile phone 13 will be described with reference to FIGS. 2, 3, and 4. 2 is an external view of the mobile phone 13 viewed from the front, and FIG. 3 is an external view of the mobile phone 13 viewed from the back.

  As shown in FIG. 2 and FIG. 3, the mobile phone 13 is provided with a main body 19 so that an opening / closing part 20 can be opened and closed, an operation part 23 is provided on the surface of the main body 19, and a speaker 33 is provided on the back surface of the main body 19. Provided. A display unit 21 is provided on the front surface of the opening / closing unit 20, a camera 31 is provided on the back surface of the opening / closing unit 20, and an audio input / output jack 29 is provided on a side surface of the opening / closing unit 20. The plug 28 of the headphone 27 is inserted into the audio input / output jack 29.

The display unit 21 is a liquid crystal panel.
The operation unit 23 has a numeric keypad 25. The numeric keys 25-1, 25-2, 25-3, etc. are keys for inputting numbers 1, 2, 3, etc., respectively. In addition to the numeric keys, the operation unit 23 includes keys for function selection. Here, keys other than “0” to “9” are included in the numeric keypad 25. The numeric keypad 25 may be connected to the main body 19 by providing an external numeric keypad other than the one installed on the main body 19.

  The camera 31 captures an object. The speaker 33 outputs a sound such as a ringtone.

FIG. 4 is a block diagram showing the configuration of the mobile phone 13.
As shown in FIG. 4, in the mobile phone 13, a control unit 41, a communication unit 43, a storage unit 45, a display unit 21, an operation unit 23, a camera 31, an audio interface 49, and the like are connected to each other via a bus 47.

The control unit 41 includes a CPU (Central Processing Unit) and the like. The communication unit 43 transmits and receives wireless signals via an antenna.
The storage unit 45 includes a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The storage unit 45 holds an execution program of the traffic data measurement system 1, measurement data, image data of measurement positions, and data for performing arithmetic processing.
Headphones 27 and speakers 33 are connected to the audio interface 49.

  The mobile phone 13 has a GPS function. That is, the control unit 41 acquires position information (latitude information, longitude information) of the mobile phone 13 using a signal from an artificial satellite. The mobile phone 13 has a clock function. That is, the control unit 41 acquires time information.

  The mobile phone 13 transmits the data, time information, and position information input from the operation unit 23 to the base station 17 through the communication unit 43 as radio signals. Further, when the numeric keypad 25 is pressed, the mobile phone 13 outputs a different voice for each numeric keypad.

  Next, the configuration of the server 11 will be described with reference to FIG. FIG. 5 is a block diagram illustrating a configuration of the server 11.

  As shown in FIG. 5, in the server 11, a control unit 51, a storage unit 52, a media input / output unit 53, a communication control unit 54, an input unit 55, a display unit 56, a printing unit 57, etc. are connected to each other via a bus 58. Is done.

The control unit 51 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like.
The CPU calls a program stored in a recording unit, ROM, or the like to a work memory area on the RAM and executes it, performs arithmetic processing and operation control, and controls the entire system. The ROM is a non-volatile memory that permanently holds programs, data, and the like, and the RAM is a volatile memory that temporarily holds programs, data, and the like.

  The recording unit 52 is a device that stores data, and includes a magnetic disk, a memory, an optical disk device, and the like. The recording unit 52 stores a program executed by the control unit 51, data necessary for program execution, an OS (Operating System), and the like.

The media input / output unit 53 has a drive device such as a floppy (registered trademark) disk, CD-ROM, etc., and transfers input data from an external medium to the control unit 51 and stores output data in the external medium.
The communication control unit 54 is a communication interface that mediates communication between the server 11 and the network 15, and includes a communication control device, a communication port, and the like.

The input unit 55 inputs data and includes, for example, a keyboard, a pointing device such as a mouse, and an input device such as a numeric keypad.
An operation instruction, an operation instruction, data input, maintenance management, and the like can be performed on the server 11 via the input unit 55.

  The display unit 56 includes a display device such as a CRT monitor or a liquid crystal panel, a display device such as a logic circuit (video adapter or the like) for realizing a video function of a computer in cooperation with the display device, and the like.

The printing unit 57 includes a laser printer device that outputs data.
The bus 58 is a path that mediates transmission / reception of control signals, data signals, and the like between the devices.

  The server 11 receives the data transmitted from the mobile phone 13 and holds it in the recording unit 52. Further, the server 11 classifies the data written in the recording unit 52 and determines the reliability of the classified data.

Next, operations of the server 11 and the mobile phone 13 in the traffic data measurement system 1 will be described with reference to FIGS.
FIG. 6 is a flowchart showing operations of the server 11 and the mobile phone 13 during data collection. FIG. 7 is a flowchart showing the operation of the server 11 during data analysis.
8 to 10 show data held by the mobile phone 13.
FIG. 11 is a 60-decimal decimal table 110 referred to at the time of compression, and FIG. 12 is a diagram showing a data compression method when saving in the storage unit 45 of the mobile phone 13. FIG. 13 shows data held in the server 11.

When measuring the traffic data, the measurer starts up a program for executing the present embodiment on the mobile phone 13. By starting this program, the mobile phone 13 can be used as a counter as will be described later.
As shown in FIG. 6, the measurer takes an image at the measurement point and stores it. That is, the camera 31 captures an image of the measurement point. Then, the control unit 41 writes the captured image in the storage unit 45 together with time information and position information (step 601).

  That is, the control unit 41 can acquire the time information and the position information taken by the camera 31 using the position measurement function and the time measurement function described above, and therefore the time information and the position information together with the image information are stored in the storage unit 45. Write to. At this time, the control unit 41 compresses the time information and the position information and writes them in the storage unit 45 (described later with reference to FIGS. 11 and 12).

The measurer starts traffic data measurement and presses the numeric keypad corresponding to the vehicle type to pass.
That is, when the mobile phone 13 starts traffic data measurement, the numeric keypad 25 is pressed. When the numeric keypad is pressed for each vehicle type, the control unit 41 reads the audio corresponding to the vehicle type from the audio table 90 and outputs the audio from the speaker 33 or the headphone 27 (step 602).

As shown in FIG. 9, the audio table 90 includes a vehicle type code 83 and audio information 91.
The vehicle type code 83 indicates the type of numeric keypad corresponding to the vehicle type. For example, if the vehicle type code 83 indicates “1 = large cargo”, “2 = large passenger”, “3 = small passenger”, etc., the “1” numeric keypad 25-1, “large” The “2” numeric keypad 25-2 is pressed when “passenger” passes, and the “3” numeric keypad 25-3 is pressed when “small passenger” passes.

  The audio information 91 is audio data output from the speaker 33 or the headphone 27 of the mobile phone 13 when the numeric keypad 25 corresponding to the vehicle type code 83 is pressed. For example, the cellular phone 13 outputs a voice “large cargo” when the “1” numeric keypad 25-1 is pressed. As a result, the operator confirms that the correct numeric keypad 25-1 corresponding to the “large cargo” has been pressed.

  Next, the control unit 41 writes, in the storage unit 45, the vehicle type data 80 together with the time information 81 and the position information 85 when the numeric keypad 25 is pressed for the vehicle type (step 603). At this time, the control unit 41 compresses the vehicle type data 80 and writes it in the storage unit 45.

  As shown in FIG. 8, the vehicle type data 80 includes time information 81, a vehicle type code 83, and position information 85. The time information 81 indicates the time when the numeric keypad corresponding to the vehicle type is pressed.

  The vehicle type code 83 is the same as the vehicle type code 83 of FIG. When the measurer presses a different numeric keypad for each vehicle type, the mobile phone 13 stores the input numeric value of the numeric keypad 25 as the vehicle type code 83 in the storage unit 45.

  The position information 85 indicates the position of the mobile phone 13 when the numeric keypad corresponding to the vehicle type is pressed, that is, the measurement point. The measurer can also move the measurement point and perform measurement. Therefore, there may be records having different position information in the measurement data of the same measurer.

  The mobile phone 13 repeats the processing from step 602 unless 10 minutes have elapsed since the measurement start time or the previous transmission time to the server 11.

  If 10 minutes have elapsed since the measurement start time or the previous transmission time to the server 11, the control unit 41 transmits the accumulated data to the server 11 as measurement data 100 (step 604). The control unit 41 can further transmit the position information 85 to the server 11 at predetermined time intervals (for example, 5 seconds).

  As shown in FIG. 10, the measurement data 100 includes an ID 101, time information 81, a vehicle type code 83, position information 85, and image information 103. ID 101 indicates the user ID of the measurer. The time information 81 is the same as the time information in FIG. The vehicle type code 83 is the same as the vehicle type code 83 of FIG. The position information 85 is the same as the position information 85 in FIG. Image information 103 indicates image data taken for 10 minutes when measurement data is accumulated.

  The mobile phone 13 stores time information 81, a vehicle type code 83, and position information 85 for 10 minutes. The mobile phone 13 transmits the accumulated data to the server 11 after 10 minutes together with the image information 103. The server 11 writes the data received from the mobile phone 13 in the recording unit 52. In addition, the time interval transmitted to the server 11 is not limited to 10 minutes. Further, the transmission of the image information 103 may be performed only once at the same measurement point.

  The control unit 51 of the server 11 receives data from the mobile phone 13 (step 605). The server 11 and the mobile phone 13 repeat the processing from step 602 to step 605 until the measurement time ends.

Through the above process, the cellular phone 13 compresses the captured image information, time information, position information, and ten key data pressed for each vehicle type, that is, the vehicle type code, and writes the compressed data in the storage unit 45. The mobile phone 13 transmits the data accumulated for 10 minutes to the server 11. The server 11 receives data from the mobile phone.
The mobile phone 13 outputs a sound corresponding to the pressed numeric keypad every time the numeric keypad is pressed for each vehicle type.

  In this way, the data input by the mobile phone 13 is immediately transmitted accurately and stored on the server 11. As a result, the trouble of manually inputting the data again can be saved, and the time until the data is actually analyzed is greatly shortened. In addition, since a voice is output according to the pressed numeric keypad, it is possible to prevent an input error.

  Next, a compression method for the time information 81, the position information 85, and the like will be described with reference to FIGS.

  The control unit 41 of the mobile phone 13 converts the decimal data 112 into the hexadecimal data 111 for the numerical values of the time information 81 and the position information 85. At this time, the 60-decimal decimal correspondence table 110 shown in FIG. 11 is referred to. For example, “10” in the decimal data 112 is “a” in the hexadecimal data 111, and “30” in the decimal data 112 is “u” in the hexadecimal data 111.

  In FIG. 12, the measurement data 100 is the same as the measurement data 100 of FIG. The post-compression data 120 is obtained by compressing the measurement data 100.

In the measurement data 100, “ID” 121 indicates the user ID of the measurer, “count” 123 indicates the number of transmissions, and “eof” 125 indicates a transmission end flag.
These are header data added to the head of the record in one transmission unit.
Actual measurement data is shown in records 201-205. One record includes time information 81, vehicle type code 83, latitude 87, and longitude 89. The image information 103 may be included.

The control unit 41 converts these records using the 60-decimal decimal correspondence table 110 and then writes the records in the storage unit 45.
As shown in the data 121a, the data 123a, and the data 125a, the header data is converted to 60-hexadecimal and further written without characters such as “ID =” and “eof =”.

  A record 201 indicates the first measurement data. In the record 201 in the measurement data 100, “20050610110146” of the time information 81 indicates “June 11, 2005 11:01:46”, but “2005” is “xp”, “6”. “6”, “10” is converted to “a”, “11” is converted to “b”, “1” is converted to “1”, and “46” is converted to “K”. Therefore, “xp6ab1K” is written in the storage unit 45 as indicated by the data 201a in the compressed data 120.

  Further, the control unit 41 of the mobile phone 13 writes the difference from the previous record in the storage unit 45 for the second and subsequent measurement data.

  For example, in the second record 202 in the measurement data 100, “20050610110209” of the time information 81 is compared with “20050610110146” of the time information 81 of the record 201. The control unit 41 converts the difference between the two values, 23 (seconds), into 60, and writes “n” in the storage unit 45. Since the vehicle type code 83 is a value indicated by a single digit, the numeric keypad data may be written without being compressed. The position information is indicated by NULL data because the latitude 87 and longitude 89 are the same values as the previous record.

Further, the control unit 41 converts the difference number of the time information 81 to 60 and writes the third record 203 in the storage unit 45 as in the case of the record 202.
As a result, in the storage unit 45, the second record 202 is “n, 2,...” Shown in the record 202a of the compressed data 120, and the third record 203 is shown in the record 203a of the compressed data 120. “N, 1,...” Is held.

  The control unit 41 similarly performs data compression when the measurement position is moved. For example, for the latitude 87 of the fourth record 204 of the measurement data 100, the difference number “−100” of the latitude from the previous record 203 is converted to 60, and “−1E” is written in the record 204a.

  Even when image data is acquired during measurement, the control unit 41 similarly compresses the data. For example, in the fifth record 205 of the measurement data 100, “20040610101510” of the image information 103 indicates an image file name or the like, which is converted to 60-hexadecimal, and “xo6aaa” is written in the record 205a.

  As described above, the control unit 41 of the mobile phone 13 converts the numerical values such as the time information and the position information into 60 values, and further compresses the data using the difference number or NULL data in order to avoid duplication of data. .

  As described above, since the cellular phone 13 compresses and saves the acquired time information and position information data, the use amount of the storage unit 45 of the cellular phone 13 is suppressed, and the server 11 Load and time required for data transmission can be reduced.

  In FIG. 7, the control unit 51 of the server 11 classifies the data received from the plurality of mobile phones 13 for each user ID when the data is accumulated for one day (24 hours) (step 701). In addition, after accumulating data for several days, you may classify | categorize for every user ID.

  The control unit 51 calculates all the measurement times of the classified data, that is, the time intervals when the numeric keypad is pressed (step 702).

  If there is a portion in the accumulated data where the measurement time interval exceeds the threshold, the control unit 51 extracts the data in the corresponding time zone and writes it in the recording unit 52. (Step 703).

  FIG. 13 shows measurement data 100 accumulated for 24 hours at a certain measurement point. The time information 81, vehicle type code 83, position information 85, latitude 87, and longitude 89 are the same as the time information 81, vehicle type code 83, position information 85, latitude 87, and longitude 89 in FIG.

For example, assume that the threshold is set to 30 minutes. When the two time information 81 shown in A [131] are compared and the measurement time interval exceeds 30 minutes, the control unit 51 determines that the data at the corresponding time zone and the corresponding measurement point has low reliability. judge. That is, when the car is not passing for 30 minutes, the measurer may be away from the seat and the traffic data may not be measured, so the data in the vicinity is assumed to be unreliable.
In the case of FIG. 13, since 30 minutes or more have passed from “7:48:35” to “8:32:56”, the data in this vicinity is assumed to have low reliability.

The control unit 51 writes data such as “7 o'clock range” and “8 o'clock range” including the data determined to be low in reliability to the recording unit 52. Alternatively, data such as “6:48:35 to 9:32:56” may be held by taking one hour before and after the two time information 81 exceeding the threshold.
Regarding the threshold value, a mechanism may be added so that the setting standard can be changed depending on the type of road, the measurement time zone, and the like.

  Through the above process, the server 11 classifies the data received from the mobile phone 13 based on time information and position information. Further, the server 11 records data in which the threshold of the measurement time interval exceeds a certain value.

  In this way, the server 11 can analyze the accumulated data immediately after the end of the measurement time, so that it is possible to immediately grasp the actual working condition of the investigator and determine the reliability of the data. For example, when the threshold is set to 30 minutes, if the researcher leaves the seat for 30 minutes or more and does not press the numeric keypad, the data can be determined as data with low reliability and can be excluded during analysis.

  As described above, the traffic data measurement system 1 according to the present invention can automate the process from traffic data survey input to analysis to improve efficiency.

  In the present embodiment, the case where the measurer moves between a plurality of measurement points with the mobile phone 13 has been described. However, the measurement may be performed while the measurer is stationary at one measurement point. In this case, acquisition and transmission of position information and image information can be performed only at the start of measurement.

  The server 11 can also perform various analyzes such as not only the traffic volume but also the vehicle head distance, the number of judgments, the travel time, etc. by using the measurement data 100 at a plurality of points or using the measurement data 100 at a plurality of time zones. it can.

  Furthermore, using the traffic data measurement system 1, it is also possible to perform wild bird measurement and the like in bird watching.

  The preferred embodiments of the traffic data measurement system, portable terminal, server, and the like according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

The figure which shows the whole structure of the traffic data measurement system 1 The figure which shows the external appearance from the table | surface of the mobile telephone 13 The figure which shows the external appearance from the back of the mobile telephone 13 Block diagram showing the configuration of the mobile phone 13 Block diagram showing the configuration of the server 11 Flow chart showing operations of mobile phone 13 and server 11 at the time of data input Flow chart showing operation of server 11 during data analysis The figure which shows the one aspect | mode of the vehicle type data 90 The figure which shows the one aspect | mode of the audio | voice table 110. The figure which shows the one aspect | mode of the measurement data 100 Table showing hexadecimal conversion at the time of data compression Diagram showing an example of data compression The figure which shows the one aspect | mode which accumulated the measurement data 100 with the server for 24 hours.

Explanation of symbols

1 ……… Traffic data measurement system 11 ……… Server 13 ……… Mobile phone 15 ……… Network 17 ……… Base station 19 ……… Body 25 ……… Numpad 27 ……… Headphone 31 ……… Camera 33 ... …… Speaker 100 ……… Measurement data

Claims (16)

A traffic data measurement system in which a server and a mobile terminal are connected to a network and measure traffic data,
The portable terminal is
Numeric keypad,
Position measuring means for measuring position information;
Time measuring means for measuring time information;
Sampling means for collecting position information measured by the position measuring means and time information measured by the time measuring means when a car is counted by the numeric keypad;
A traffic data measurement system comprising: a count value counted by the numeric keypad; the position information collected by the collection means; and a holding means for holding the time information.   The traffic data measurement system according to claim 1, wherein the numeric keypad is assigned to each vehicle type.   2. The traffic data measurement system according to claim 1, further comprising means for emitting a different sound or voice for each numeric keypad when the numeric keypad is pressed. Means for compressing the position information and the time information when the position information and the time information are acquired;
The traffic data measuring system according to claim 1, wherein the holding unit holds the compressed position information and the time information.   5. The traffic data measuring system according to claim 4, wherein the compression is performed by converting a difference between records having the position information and the time information into a 60-digit number.   2. The traffic data measuring system according to claim 1, further comprising a transmission unit that transmits the count value, the position information, and the time information held by the holding unit to the server. The server includes means for measuring an interval between time information among time information transmitted from the mobile terminal,
Means for comparing the interval with a threshold to determine reliability;
The traffic data measuring system according to claim 1, further comprising:   The traffic data measuring system according to claim 1, wherein the mobile terminal is a mobile phone. A mobile terminal connected to a server via a network,
The portable terminal is
Numeric keypad,
Position measuring means for measuring position information;
Time measuring means for measuring time information;
Sampling means for collecting position information measured by the position measuring means and time information measured by the time measuring means when a car is counted by the numeric keypad;
A portable terminal comprising: a count value counted by the numeric keypad; the position information collected by the collection means; and a holding means for holding the time information.   The mobile terminal according to claim 9, wherein the numeric keypad is assigned to each vehicle type.   10. The portable terminal according to claim 9, further comprising means for emitting a different sound or voice for each numeric keypad when the numeric keypad is pressed. Means for compressing the position information and the time information when the position information and the time information are acquired;
The portable terminal according to claim 9, wherein the holding unit holds the compressed position information and time information.   The portable terminal according to claim 12, wherein the compression is performed by converting a difference between records having the position information and the time information into a 60-digit number.   The portable terminal according to claim 9, further comprising a transmission unit that transmits the count value, the position information, and the time information held by the holding unit to the server.   The mobile terminal according to claim 9, wherein the mobile terminal is a mobile phone. A server that is used in a traffic data measurement system that measures traffic data, is connected to a mobile terminal via a network, and sends a count value, position information, and time information when counting cars from the mobile terminal,
Of the time information sent from the mobile terminal, means for measuring the interval between the time information,
The server further comprising means for comparing the interval with a threshold to determine reliability.

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