0 -> PP
PP -> 0
0 -> NP
NP -> 0
NP -> 0
0 -> STAB
0 -> STAB
STAB -> 0
BAS -> EP1
BAS -> EP1
EP1 -> ED
EP1 -> BAS
EP1 -> EP2
EP2 -> ED
EP2 -> BAS
ED -> BAS
ED -> LP
LP -> BAS
0 -> UPS
0 -> UPS
UPS -> 0