; pos=no warn=0 dummy=crlf
A B 1 0 0
C D 1 0 0
C A 1 0 0
C E 1 0 0
E D 1 0 0
E A 1 0 0
D F 1 0 0
F G 1 0 0
F H 1 0 0
H I 1 0 0
I H 1 0 0
H F 1 0 0