Let = {0,1} . For each part below, write the regular expression that describes the set, 20 points a) = { wl w starts with 0 and is of odd length or ends with 1 and length is a multiple of three) b) L2 w is any string except 00, 11, 100, and 101 c) L d) L is any string except the empty string xy |x is an odd number of ls and y is an even number of Os and y 23