Thanks.O-钝,R-直,A-锐。第二问我得到七种。第三问12种我还没来得及想呢!能够证明这是完全无遗漏的吗?
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Yes, if we recognize the graph in mirror is the same as the gra
-jinjing-
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10/17/2010 postreply
19:34:32