A grammar derivation is a finite sequence of words in which each step replaces one occurrence of a production's left side by its right side. A leftmost derivation always replaces the leftmost available nonterminal.
A grammar derivation that always expands the leftmost remaining nonterminal symbol. In a context-free grammar, each parse tree specifies exactly one leftmost derivation. Two distinct leftmost derivations of the same word therefore prove that the context-free grammar is an ambiguous grammar.
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