Classify the following as either phoneNumbers

Posted: January 7th, 2022

Answer questions (a) and (b) for the following grammar.

(a) Classify the following as either phoneNumbers (in the

grammar). For numbers not in the grammar, state why not.

123-4567

012-3456

109-1212

246-9900

113-1111

(b) Consider the following mutation of the grammar:

If possible, give a string that appears in the mutated grammar

but not in the original grammar, another string that is in the

original but not the mutated, and a third string that is in both.