Question: 4. A unit pair (X,Y) for a context-free grammar is a pair where: 1. X and Y are variables (nonterminals) of the grammar 2. There

4. A unit pair (X,Y) for a context-free grammar is a

4. A unit pair (X,Y) for a context-free grammar is a pair where: 1. X and Y are variables (nonterminals) of the grammar 2. There is a derivation X =>* Y that uses only unit productions (productions with a body that consists of exactly one occurrence of some variable, and nothing else). For the following grammar Identify all the unit pairs. Then, select from the list below the pair that is NOT a unit pair. a) (C,A) b) (B.A) c) (D,E) d) (S,C)

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