
nite alphabet having at least two letters. In this paper, we prove the language D(1) of all non-overlapping (d-primitive) words, which is a proper subset of Q, cannot be generated by Marcus contextual grammars both in the external mode and in the internal mode.
d-primitive word, non-overlapping word, formal language, Marcus contextual grammar and language, primitive word, context-free
d-primitive word, non-overlapping word, formal language, Marcus contextual grammar and language, primitive word, context-free
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