Abstract
We introduce two new grammatical interpretations which enlarge the grammatical collection of a given grammar. Briefly, the relations between these interpretations are presented, and also the effect on the generative capacity of a grammar system of the demand that all its components are similar to a given grammar. Especially, one obtains an important increase of the gene rative power if one requires that any component of the system is a b- or w-interpretation of a context free grammar.
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