m-command(In theoretical linguistics, m-command is a syntactic relation between two elements in a tree structure. It is a broader version of c-command, and like c-command, it is defined over the constituency-based trees associated with the phrase structure grammars (= constituency grammars) of the Chomskyan tradition (government and binding, minimalist program); it is therefore not applicable to the structures that other theories of syntax assume. wikipedia.org)
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