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Conditions for a phrase-structure grammar (Chomsky 0-type grammar) are established which warrant that any of its derivations univocally defines a syntactical structure of the sentence. The simplifications for the particular cases of contextsensitive and context-free grammars are indicated.doi:10.1016/s0022-0000(72)80006-0 fatcat:f2akjxq62rg6vhuh76hhhdouxu