19
(((((((RS)Q)P)(ON))(ML))((JK)((IH)(G(F(ED))))))(C(BA)))
A tha rec
B cen rec
C cen rec
D rec rec
E apt rec
F hau rec
G apt rec
H san rec 
I cmp rec
J tha rec
K tar rec
L apt rec
M alb rec
N rec rec 
O prb rec
P con rec
Q cmp rec
R san rec
S san rec