Write a BNF and EBNF for the following languages.

(a) The set of strings consisting of zero or more 1's

(b) The set of all the strings consisting of letters or a letter followed by characters which could be a letter or digits.

(c) The set of all the strings consisting of the keyword begin, followed by one or more statements with a semicolon after each one, followed by a keyword end. Use non-terminal for statements.

what does "less knowledge" mean ?