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30. a) Construct a phrase-structure grammar for the set of all fractions of the form a/b, where a is a signed integer in decimal notation

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30. a) Construct a phrase-structure grammar for the set of all fractions of the form a/b, where a is a signed integer in decimal notation and b is a positive integer. b) What is the Backus-Naur form for this grammar? c) Construct a derivation tree for +311/17 in this grammar

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