delet old PA1.py, add repositories for EX1 and EX2
delet old PA1.py, add repositories for EX1 and EX2

appfs/appfs,FirstSanny/appfs,ray-chew/appfs,FirstSanny/appfs,appfs/appfs,frodo4fingers/appfs,appfs/appfs,FirstSanny/appfs,frodo4fingers/appfs,FirstSanny/appfs,FirstSanny/appfs,frodo4fingers/appfs,frodo4fingers/appfs,appfs/appfs,FirstSanny/appfs,appfs/appfs,FirstSanny/appfs,appfs/appfs,frodo4fingers/appfs,frodo4fingers/appfs,appfs/appfs,frodo4fingers/appfs