Gordon Royle of the University of Western Australia has collected more than 38,000 examples that fit this criterion and cannot be translated into one another by performing elementary operations.
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美
- 西澳大學(xué)的羅艾爾（GordonRoyle）已經(jīng)蒐集了38000多個(gè)滿(mǎn)足這個(gè)條件的例子，這些例子是已經(jīng)化約過(guò)，不能靠換行或換列來(lái)相互轉換的。
