设 S：2是偶数 Q：3是奇数 R：3能被2整除
从题意得到 前提：S->Q SvR ┓R 结论：Q
（1） ┓R P
(2) SvR P
（3）┓R->S T（2）
（4） S T（1）（2）I
（5）S->Q P
（6）Q T（4）（5）I
命题 if 2 is an even number,then 3 is an odd number.2 is an ev
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