Completed EX13-1
Completed EX13-2 & 13-3
Completed EX13-4
Completed EX13-6
Completed EX13-7
Completed EX13-8
Completed EX14-1 & 14-2
Completed EX14-3
Completed 15-1
Completed 15-3, 15-4, 15-5