Exercise 1 Give a BNF grammar for each of the languages below. For example, a correct answer for "the set of all strings consisting of zero or more concatenated copies of the string ab" would be this grammar: S2.4i- ab syI samppos There are often many correct answers: c. The set of all strings consisting of one or more as e. The set of all strings consisting of zero or more as with a semicolon after each one. f. The set of all strings consisting of the keyword.begin, followed by zero or more statements with a semicolon after each one, followed by the keyword end. Use the non-terminal