1-Give a BNF grammar (do not use EBNF) for the language that generates 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 for statements, and do not give productions for it.

2-Give a BNF grammar (do not use EBNF) for the language that generates the set of all strings consisting of the keyword begin, followed by one or more statements with a semicolon after each one, followed by the keyword end. Use the non-terminal for statements, and do not give productions for it.

3-Give a BNF grammar (do not use EBNF) for the set of all strings consisting of zero or more as, with a comma between each a and the next. (There should be no comma before the first or after the last.)

4-Give a BNF grammar (do not use EBNF) for the set of all strings consisting of an open bracket (the symbol [) followed by a list of zero or more digits separated by commas, followed by a closing bracket (the symbol ]).