16
(E(((J((AL)H))(BC))(G(I((MD)(((FK)(NP))O))))))
A pia rec
B pia rec
C rec rec
D tar rec
E rec rec
F pia rec
G rec rec
H gel rec
I rec rec
J zan rec
K rec rec
L pia rec
M tar rec
N pia rec
O pia rec
P pia rec