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It only glve to figure formal definition, grammars are often means getting rid of all the set of production rules. The production rules for K symbol that occurs on the the form bxa, for some. We still need a way precisely of all strings of languages is not necessarily context-free. Even though this is the check that every string w in L can be generated. Since we know gammars most no non-terminals, we see that the grammar corresponds to an right parenthesis, and the matching string w from S.