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每个(n,k)-语言都是左-(n,k)-语言,给出了uv+以及A(ak)+是左-(n,2)-语言但不是(n,2)-语言的条件.“,”Every (n,k) language is ale-ft-(n,k)-language.This paper gave some conditions for uv + and A(ak) + being a left-(n,2)-language.