... 换位 commutant 换位规则 rule of conversion 换位元 commutator ...
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“关键结构”的发现是解决换位棋的必要条件,对问题规则的错误表征影响“关键结构”的发现。
To find a key structure is a necessary condition for correct solution, and wrong representations of problem rules have negative effect in finding the key structure.
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