Write a regular expressions for the following languages_____
a) The set of strings over alphabet (a, b, c) containing at least one a and one b.
b) The set of strings of 0's and 1's whose third symbol from the right end is 1.
c) The set of strings over alphabet (a, b) that beginning with abb
d) The set of strings over alphabet (0, 1) with 011 as a substring
e) The set of strings over alphabet (0, 1) that elther begin or end (or both) with 01