20
DN 1 0
FM 2 1
GP 1 1
GJ 2 1
AE 1 2
OR 2 1
AQ 1 1
AQ 2 1
NP 1 0
HQ 2 1
DN 1 0
OQ 2 1
JT 1 0
EH 2 0
CD 1 0
CK 2 1
CO 1 1
AL 2 0
CE 1 1
BT 2 2