WO2005119229A1 - 不純物元素の濃度の測定の方法 - Google Patents
不純物元素の濃度の測定の方法 Download PDFInfo
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- WO2005119229A1 WO2005119229A1 PCT/JP2005/010146 JP2005010146W WO2005119229A1 WO 2005119229 A1 WO2005119229 A1 WO 2005119229A1 JP 2005010146 W JP2005010146 W JP 2005010146W WO 2005119229 A1 WO2005119229 A1 WO 2005119229A1
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- measurement
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- concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/225—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/225—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion
- G01N23/2255—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion using incident ion beams, e.g. proton beams
- G01N23/2258—Measuring secondary ion emission, e.g. secondary ion mass spectrometry [SIMS]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
Definitions
- the present invention relates to a method for measuring the concentration of an impurity substance contained in a main component substance.
- SIMS Secondary Ion Mass Spectrometry
- the raster change method is a method that is often used when performing SIMS analysis on atmospheric constituent elements (H, C, N, O, etc.).
- background is generated due to the adsorbed components on the sample surface and the inner wall of the chamber, residual gas in vacuum, and the like.
- the detection signal of the secondary ions of the impurity element to be measured the lower detection limit of the measured concentration of the impurity element is deteriorated, or the detection signal is unstable.
- the measurement of the secondary ions of the main component substance and the impurity element is performed twice while changing the irradiation density of the primary ions, so that such background contribution can be separated and calculated. . If the background can be calculated in this way, it is possible to cancel the contribution from the detection signal and calculate the concentration of the contained impurity at a lower concentration than the knock background.
- Non-Patent Document 1 Toray Research Center, "Microanalysis of Atmospheric Elements in Semiconductor Materials", [online], [Search on June 3, 2004], Internet ⁇ URL: http: ⁇ www.toray-rese arch .co.jp / sims / pdf / taikiseibun.pdf>
- the present invention provides a method for measuring the concentration of an impurity even while the intensity of the secondary ion is attenuated by approximating the temporal change of the intensity of the secondary ion. Provide a way to make it possible. More specifically, the following is provided.
- a method of calculating the concentration of an impurity element contained in a main component substance by SIMS is based on the first measurement condition during the first measurement period.
- a calculation step of calculating the concentration of the impurity element by the calculation unit wherein the first measurement condition and the second measurement condition include different primary ion irradiation densities, and the first dependency and the second The difference between the two dependencies is the first Wherein the constant for all of the elapsed time included in either regular or between the second measurement period.
- the concentration of the impurity element is also reduced in the process in which the intensity of the secondary ion is attenuated according to the elapsed time.
- Such a step is performed by performing primary ion irradiation different from the measurement over a predetermined second measurement period different from the first measurement period.
- the concentration of the impurity element can be calculated. As a result, the concentration of the impurity element can be calculated even during the measurement period in which the secondary ion intensity changes over time, so that the waiting time until the measurement is reduced, and an improvement in the measurement throughput can be expected.
- each of the predetermined first measurement period and the predetermined second measurement period may be a continuous period or a discontinuous period (for example, an intermittent period).
- the first measurement period may be a divided period sandwiching the second measurement period.
- the aging A and the aging B, and the aging A 'and the aging B' may be approximate functions that can be extrapolated to each other or one force and the other.
- the change A with time can extrapolate the change over time of the intensity of the secondary ion with respect to the main component in the second measurement period.
- the optimization function FA (t) representing the main component material of the first dependence relationship
- the optimization function FB (t) representing the impurity substance
- the main component of the second dependence relationship The same effect as (1) can be expected by calculating the optimization function FA '(t) representing the substance and the optimization function FB' (t) representing the impurity substance by the least square method.
- the optimization equation for FA (t) is obtained by the first least-squares method, and then the zero-order coefficient (i.e., the constant term) is to be optimized.
- FA (t) and FA '(t) may be equal to each other for higher-order coefficients other than zero-order coefficients (i.e., constant terms), and zero-order coefficients obtained by one least squares method. You can find all the coefficients, including. Such a variation of the procedure is possible for FB (t) and FB, (t) as well.
- an optimization function representing the first dependency and the second dependency. More specifically, for example, setting a sample in a chamber After that, in the process where the intensity of the secondary ions attenuates more with the elapsed time, for example, immediately after the pressure in the chamber is started, these dependencies are relatively higher-order polynomial functions. Alternatively, when the attenuation is smaller, such as after expiration of a non-polynomial function such as an exponential function, the dependence can be expressed by a relatively low-order polynomial function.
- Any one of (1) to (3) including: the measurement unit, the calculation unit, and a control unit that controls the measurement unit and the calculation unit. Apparatus for performing the method described in
- the concentration of the impurity element can be calculated by the method according to any one of the above (1) to (3).
- a SIMS device including the measurement unit, the calculation unit, and a control unit that controls the SIMS device and the calculation unit, (1) to (3).
- the concentration of the impurity element can be calculated by the method according to any one of the above (1) to (3).
- FIG. 1 is a diagram showing the principle of SIMS.
- FIG. 2A is a view schematically showing a wide raster state for explaining the principle of the raster change method.
- FIG. 2B is a diagram schematically showing a narrow star state for explaining the principle of the raster change method.
- FIG. 2C is a diagram schematically showing the depth at the time of wide raster for explaining the principle of the raster change method.
- FIG. 2D is a diagram schematically showing a depth at the time of a narrow star for explaining the principle of the raster change method.
- FIG. 3A is an example showing a change over time in count intensity of SIMS measurement.
- FIG. 3B is a view schematically showing a change over time in count intensity in an area A in FIG. 3A.
- FIG. 3C is a diagram schematically showing a change over time in count intensity in a region B in FIG. 3A.
- FIG. 4A is an enlarged view showing a time-dependent change in Si count intensity in a region A in FIG. 3A.
- FIG. 4B is an enlarged view showing the time-dependent change of the C count intensity in region A of FIG. 3A.
- FIG. 5 is a view showing a calculation result of a C concentration in an area A of FIG. 3A.
- FIG. 6A is an enlarged view showing a time-dependent change in Si count intensity in a region B in FIG. 3A.
- FIG. 6B is an enlarged view showing a change over time in C count intensity in a region B in FIG. 3A.
- FIG. 7 is a view showing a calculation result of a C concentration in an area B in FIG. 3A.
- FIG. 8 is a diagram showing an example of a SIMS device for measuring the concentration of an impurity.
- FIG. 9 is a diagram showing an example of the entire configuration of an apparatus for measuring the concentration of an impurity.
- FIG. 10 is a diagram showing a procedure for measuring the concentration of impurities.
- FIG. 11A is a diagram showing an experimental example (Si) in which the raster change method is applied in SIMS measurement.
- FIG. 11B is a diagram showing an experimental example (N) in which the raster change method is applied in SIMS measurement.
- FIG. 12 is a diagram showing the accuracy results of measured concentrations of impurity elements in Balta Si.
- the present invention application to the evaluation of the concentration of the impurity element C in Balta Si, whose main component is silicon, will be described. Note that the present invention is not limited to C, but can be applied to the evaluation of the concentration of various impurity elements, and the technical scope of the present invention is not limited to the case of the present embodiment.
- FIGS. 2A to 2D show an example of a primary ion beam scanning method using a raster change method applied in the present embodiment.
- Fig. 2A shows a raster scan of a wide raster with a relatively low irradiation density
- Fig. 2B shows a raster scan of a narrow raster with a relatively high irradiation density.
- the total current amount of the irradiated primary ions is constant, and the areas scanned by raster are different. Therefore, the sputter depth is different from d and d in FIGS. 2A and 2B because the volume to be sputtered is in principle the same (d is smaller than
- the concentration [C] of the impurity (C in this case) and the concentration [C] of the background target element in the raster change method are determined as follows.
- the RSF Relative Sensitivity Coefficient
- the directly measured signal intensities are I (Narrow Raster) and I (Wide Raster) for C, and I (Wide Raster) for Si.
- FIGS. 3A to 3C show an example of measurement results of secondary ions of the main component substance Si and the impurity element C measured by the above-described method.
- the horizontal axis is the elapsed time
- the vertical axis is the measured secondary ion intensity of Si and C [count Zsec].
- the intensity of secondary ions of Si and C attenuates in accordance with the elapsed time in region A, and a sufficient time has elapsed since the start of decompression in the chamber in region B.
- the intensity of the secondary ions of Si and C is almost constant regardless of the elapsed time.
- two steps Left Step (A,: B) and Right Step (A
- the irradiation density of the primary ions is changed. More specifically, the left step is changed to Wiae Raster; 0 et al. To Narrow Raster, and the right step is changed to Narrow Raster force to Wide Raster.
- Figs. 4A and 4B are enlarged views of the measurement results in the area A in Fig. 3A.
- Narrow Fit first dependence; Equation 3
- Wide Fit second dependence; Equation 4
- the first dependency; Equation 5) and the Wide Fit are calculated as quadratic functions of time (X), respectively.
- the measurement time in each of Narrow Fit and Wide Fit was about 600 seconds, respectively.However, in the transition time from Narrow Fit to Wide Fit or from Wide Fit to Narrow Fit, the irradiation condition Since a measurement value that is difficult to be constant is not always stable, it is preferable that the measurement value is not included in the measurement time for obtaining the first and second dependences by approximation (the same applies hereinafter).
- the least-squares method used here assumes that higher-order coefficients other than the zero-order coefficient (i.e., the constant term) are equal to each other, and that the least-squares This is based on a method of obtaining a coefficient. Thus, the difference between these functions is constant over time (or the difference is a constant term).
- FIG. 5 shows a calculation result of the C concentration in the region A according to the present embodiment.
- the C concentration and the C background at two times, the time corresponding to the left step and the time corresponding to the right step, are numerically displayed during the least square approximation in all the sections.
- the value of the C concentration is constant in all sections.
- the C density can be calculated in the B area by using the conventional raster change method, but cannot be calculated in the A area.
- the waiting time until the measurement of the intensity of the secondary ions in the region A is 2,000 seconds
- the waiting time until the measurement of the intensity of the secondary ions in the region B is 14,500 seconds.
- the waiting time for the measurement was reduced by about 3 hours 28 minutes (86.2%).
- FIGS. 6A and 6B are enlarged views of the measurement results in the region B in FIG. 3A.
- Narrow Fit first dependence; Equation 7
- Wide Fit second dependence; Equation 8
- the first dependency; equation 9) and the Wide Fit are calculated as quadratic functions of time (X).
- the measurement time in Narrow Fit and Wide Fit was about 600 seconds each.
- the least-squares method used here assumes that higher-order coefficients other than the zero-order coefficient (i.e., the constant term) are equal to each other, and that the least-squares This is based on a method of obtaining a coefficient. Therefore, the difference between these functions is constant with elapsed time.
- FIG. 7 shows a calculation result of the C concentration in the B region.
- the C concentration and the C background at two times, the time corresponding to the left step and the time corresponding to the right step, are numerically displayed.
- the value of each C concentration is constant in all sections.
- the secondary ion intensity for any two or more different primary ion irradiation densities may be measured.
- the Narrow Raster and Wide Raster may each be measured once (switched once).
- the primary ion irradiation density may be switched by a modulation waveform such as a sine wave or a rectangular wave.
- the measurement of the secondary ion intensity of silicon and nitrogen is performed for a predetermined period at a predetermined primary ion irradiation density, and the change with time is determined by an appropriate function (primary, secondary, several, Function such as exponent). Then, a time-dependent change A and a time-dependent change B are obtained. Further, the measurement is performed again for another predetermined period at a predetermined primary ion irradiation density different from the previous one, and the time-dependent change A ′ and the time-dependent change B ′ are similarly obtained using the respective approximate expressions.
- an appropriate function primary, secondary, several, Function such as exponent
- the concentration of the impurity element can be calculated even in a measurement period in which the secondary ion intensity changes with time, so that the waiting time until measurement can be shortened, and improvement in measurement throughput can be expected.
- FIG. 8 shows an example of a SIMS device for implementing the present invention.
- Primary ions composed of cesium ions generated by a cesium ion source 11 or oxygen ions generated by a duoplasmatron ion source 12 are applied to a sample set in a sample chamber 16 maintained in an ultra-high vacuum. Irradiation causes primary ions to collide with the surface of the sample. Due to this collision, atoms and atomic clusters are separated and repelled by the sample force (sputtering). Most of these atoms and atomic clusters are -eutral. Some of them are positively or negatively charged. ing. These secondary ions are also emitted from the surface of the sample at a depth of about lnm.
- the positively or negatively charged secondary ions are then accelerated by a transfer lens 17 and sent to a mass spectrometer, where they are separated by their mass to charge ratio. Then, only secondary ions having a specific mass-to-Z charge ratio are detected by the secondary electron intensifier and the Faraday cup 20.
- the data of the detection result is sent to a general-purpose computer, and the collected data is displayed as an element map of the sample surface, a composition depth profile of the sample, and the like.
- the current amount and beam diameter of the ion beam are adjusted by an electric field lens, and the current density of the beam is controlled. Also, centering of the ion beam and raster scan scanning are performed by the deflector.
- FIG. 9 shows an example of the overall configuration of an apparatus for implementing the present invention. It includes the SIMS device 1, the calculation unit 2, the input unit 4, the display unit 5, the memory 6, the storage unit 7, and the control unit 3 for controlling these units described with reference to FIG.
- the control unit 3 controls a series of procedures described in FIG.
- FIG. 10 shows a procedure for measuring the impurity concentration according to the present invention.
- the irradiating unit irradiates the primary ions onto the surface of the main component material at a predetermined first irradiation density under the control of the control unit (Step Sl).
- the measurement unit sequentially measures the intensity of the secondary ions of the main component substance and the impurity element over a predetermined first measurement period (Step S2).
- the irradiation unit irradiates the surface of the main component substance with primary ions at a second irradiation density different from the first irradiation density based on the control of the control unit (Step S3).
- the measurement unit sequentially measures the intensity of the secondary ions of the main component substance and the impurity element over a predetermined second measurement period (step S4).
- the calculation unit calculates the first dependency of the intensity of the secondary ion of the main component substance and the impurity element on the elapsed time in the first measurement period based on the control of the control unit (step S5).
- the calculation unit calculates a second dependence of the intensity of the secondary ions of the main component substance and the impurity element on the elapsed time in the second measurement period based on the control of the control unit (step S6).
- the calculation unit calculates the concentration of the impurity element based on the control of the control unit by using the first dependency relationship and the second dependency relationship as inputs ( Step S 7).
- the scope of application of the present invention is not limited to the above-described embodiments, but includes Ge, GaAs, SiGe and the like as main components, and atmospheric elements such as N, 0, H, C and He as impurities. Boron, P, As, Sb and Al, Ni, Fe, Cu (copper), Cr (chromium) metals used as dopants for Si and Si, and substances with high diffusion rates in Si Li, Na, K, Au, Applicable to all elements that can be measured by SIMS, such as Co, Zn, Ag, Ir, Pt, S, Se, and Ti.
- SIMS such as Co, Zn, Ag, Ir, Pt, S, Se, and Ti.
- the irradiation density of the primary ions is changed by changing the raster scanning area.
- the first dependency and the second dependency are represented by an X-order polynomial.
- a function such as an exponential function is used.
- Figures 11A and 11B show experimental examples in which the first and second dependencies were calculated as second-order functions by the least squares method in the evaluation of the concentration of impurity element N in Balta Si, whose main component is silicon. It is.
- Narlow Fit first dependence; Equation 11
- Wide Fit second dependence; Equation 12
- Narrow Fit of N intensity (count) First dependency; equation 13
- Wide Fit second dependency; equation 14
- X quadratic functions of time
- SIMS measuring device IMS-6F (CAMECA)
- the first measurement period and the second measurement period will be briefly described. These settings are set in consideration of the required accuracy and throughput (performance). It also varies depending on the substance to be measured.
- the measurement was performed with a measurement time of 5 minutes and 5 minutes for narrow and wide, respectively. Since the measurement time is proportional to the number of data detected during that time, it is possible to shorten the time if the accuracy required is reduced, for example.
- the impurity source is reduced. Measurement of elemental concentration can be performed. As a result, the waiting time until the measurement is shortened, and the measurement throughput can be improved.
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KR1020067027463A KR101096115B1 (ko) | 2004-06-03 | 2005-06-02 | 불순물 원소의 농도 측정 방법 |
EP05745976.0A EP1752761B1 (en) | 2004-06-03 | 2005-06-02 | Method of measuring concentration of impurity element |
JP2006514128A JP4707657B2 (ja) | 2004-06-03 | 2005-06-02 | 不純物元素の濃度の測定の方法 |
US11/569,827 US8090544B2 (en) | 2004-06-03 | 2005-06-02 | Method for determining concentration of impurity element |
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EP (1) | EP1752761B1 (ja) |
JP (1) | JP4707657B2 (ja) |
KR (1) | KR101096115B1 (ja) |
TW (1) | TW200602635A (ja) |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010002306A (ja) * | 2008-06-20 | 2010-01-07 | National Institute Of Advanced Industrial & Technology | 中性粒子質量分析装置及び分析方法 |
JP2018025448A (ja) * | 2016-08-09 | 2018-02-15 | 住友電気工業株式会社 | 質量分析方法 |
CN112649371A (zh) * | 2019-10-11 | 2021-04-13 | 天马日本株式会社 | 磁光测量设备 |
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KR100977194B1 (ko) * | 2008-07-07 | 2010-08-20 | 주식회사 실트론 | 이차이온질량분석기를 이용한 불순물 농도 분석방법 |
KR101323721B1 (ko) | 2012-04-24 | 2013-10-31 | 주식회사 엘지실트론 | Sims를 이용한 시료 분석 방법 |
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JPH0921768A (ja) * | 1995-07-06 | 1997-01-21 | Kao Corp | 基材表面の有機化合物の分析方法 |
JP2001021460A (ja) * | 1999-07-02 | 2001-01-26 | Nec Corp | 二次イオン質量分析のための定量用標準試料の作製方法 |
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US4733073A (en) * | 1983-12-23 | 1988-03-22 | Sri International | Method and apparatus for surface diagnostics |
JPH05188020A (ja) * | 1991-09-17 | 1993-07-27 | Sony Corp | 2次イオン質量分析法による定量分析方法及び2次イオン質量分析装置 |
US6035246A (en) * | 1994-11-04 | 2000-03-07 | Sandia Corporation | Method for identifying known materials within a mixture of unknowns |
DE19720458C1 (de) * | 1997-05-15 | 1998-12-03 | Atomika Instr Gmbh | Verfahren zur Analyse einer Probe |
US6603119B1 (en) * | 2000-05-09 | 2003-08-05 | Agere Systems Inc. | Calibration method for quantitative elemental analysis |
JP3725803B2 (ja) * | 2001-06-15 | 2005-12-14 | 株式会社東芝 | 半導体ウエハの不純物の測定方法及び半導体ウエハの不純物の測定プログラム |
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- 2005-06-02 JP JP2006514128A patent/JP4707657B2/ja active Active
- 2005-06-02 TW TW094118165A patent/TW200602635A/zh unknown
- 2005-06-02 WO PCT/JP2005/010146 patent/WO2005119229A1/ja active Application Filing
- 2005-06-02 US US11/569,827 patent/US8090544B2/en active Active
- 2005-06-02 KR KR1020067027463A patent/KR101096115B1/ko active IP Right Grant
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JPH0921768A (ja) * | 1995-07-06 | 1997-01-21 | Kao Corp | 基材表面の有機化合物の分析方法 |
JP2001021460A (ja) * | 1999-07-02 | 2001-01-26 | Nec Corp | 二次イオン質量分析のための定量用標準試料の作製方法 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010002306A (ja) * | 2008-06-20 | 2010-01-07 | National Institute Of Advanced Industrial & Technology | 中性粒子質量分析装置及び分析方法 |
JP2018025448A (ja) * | 2016-08-09 | 2018-02-15 | 住友電気工業株式会社 | 質量分析方法 |
CN112649371A (zh) * | 2019-10-11 | 2021-04-13 | 天马日本株式会社 | 磁光测量设备 |
JP2021063680A (ja) * | 2019-10-11 | 2021-04-22 | Tianma Japan株式会社 | 磁気光学式計測装置 |
JP7403272B2 (ja) | 2019-10-11 | 2023-12-22 | Tianma Japan株式会社 | 磁気光学式計測装置 |
Also Published As
Publication number | Publication date |
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EP1752761B1 (en) | 2014-03-05 |
US20090198452A1 (en) | 2009-08-06 |
JPWO2005119229A1 (ja) | 2008-04-03 |
EP1752761A4 (en) | 2009-07-08 |
US8090544B2 (en) | 2012-01-03 |
KR20070027631A (ko) | 2007-03-09 |
TW200602635A (en) | 2006-01-16 |
JP4707657B2 (ja) | 2011-06-22 |
KR101096115B1 (ko) | 2011-12-20 |
EP1752761A1 (en) | 2007-02-14 |
TWI297774B (ja) | 2008-06-11 |
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