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第二个条件没看懂，谁能帮忙解释一下~谢谢了~

Posted by B06350214 at 2008-07-15 22:39:33 on Problem 3644 
R1 and R2 return to the Green Line at the same point, but the portion of R1 to that point (ignoring the initial E and final S) is more OG than the portion of R2 to that point (also ignoring the initial E and final S), 
这个条件看不懂~~~·
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