送交者: Amsel 于 2007-07-19, 18:21:01:

回答: china algebra: 假假得真，真真得假，真假得假，假真得假 由 華有缺 于 2007-07-19, 17:23:35:

• not (a or b) (无内容) - Amsel (0 bytes) 2007-07-19, 18:31:45 (155788)
  • demogon law?? - catfish (39 bytes) 2007-07-19, 19:05:56 (155795)

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