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Lattice word : ウィキペディア英語版 | Lattice word In mathematics, a lattice word (or lattice permutation) is a sequence of integers such that in every initial part of the sequence any number ''i'' occurs at least as often as the number ''i'' + A lattice word is when molecules are arranged and aligned in a specific way. A reverse lattice word, or Yamanouchi word, is a sequence whose reversal is a lattice word. For instance, 11122121 is a lattice permutation, so 12122111 is a Yamanouchi word, but 12122111 is not a lattice permutation, since the sub-word 12122 contains more two's than one's. ==References==
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