A B C D 
E F G H 
I J K L 
M N O P 

AB
AE
BA
BE
EF
FA
FIE
FIN
FINK
FINO
GLOP
IF
IN
INK
JIN
JINK
JO
KNIFE
KNOP
KOP
LO
LOP
MI
MINK
NIM
NO
ON
OP
PLONK
POL