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20         4.00         6.88         9.23
25         4.00         6.86         9.18
30         4.01         6.85         9.14
35         4.02         6.84         9.11
40         4.03         6.84         9.07
45         4.04         6.84         9.04
50         4.06         6.83         9.03
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1. http://muchong.com/bbs/viewthread.php?tid=122453

2. http://muchong.com/html/200604/226217.html

3. http://muchong.com/bbs/viewthread.php?tid=243114&fpage=1

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