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can a BNF create left-associative operators with different precedence? can a BNF create operators with different precedence and the same left-associativity? can a BNF contain

can a BNF create left-associative operators with different precedence? can a BNF create operators with different precedence and the same left-associativity? can a BNF contain both left-associative and right-associative operators? can a BNF be both ambiguous and unambiguous?

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