Notanidiom

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visits member for 2 years, 8 months
seen Dec 21 '11 at 7:12

Dec
21
awarded  Teacher
Dec
21
awarded  Editor
Dec
21
revised Why do people say 未知数 when it is not a number?
added 147 characters in body
Dec
21
answered Why do people say 未知数 when it is not a number?