Construct a regular expression in JFLAP

a. {w{a,b} the length of w is at most 4} b. {w{a,b}w does not end with the substring ab} c. {w{a,b}w contains at most two a's or at least two b's } d. {w{a,b}w contains exactly three a's or an even number of b 's } e. {w{0,1}w does not contain any consecutive 0 's and does not contain any consecutive 1 s } f. {w{0,1}w starts with a 1 and contains an odd number of 0 's } g. {w{0,1} every substring 00 in w is followed by at least one 1} h. {w{0,1} every odd position of w is a 0}