overlapping sequence是什么意思

用法例句

This paper deals with the problems of enumeration of repeated permutations in which no element may repeated three times consecutioely.

讨论了r元的n重复排列，其中有s个元的每一个不许3个相邻的问题，作为应用，又讨论了3×n广义棋盘的2染色问题。