Find CFGs for these languages:
(i) All words that start with an a or are of the form aⁿbⁿ.
(ii) All words that have an equal number of a's and b's or are of the form aⁿbⁿ.
(iii) All words in EVEN-EVEN*.
(iv) All words of the form

aⁿbⁿa^mb^m, where n, m = 1 2 3 . . . , but m need not = n = {abab aabbab abaabb aaaabbbbab aaabbbaaabbb . . .}