8 letter words:
flipflop18,
5 letter words:
fillo8,
4 letter words:
flip9,
flop9,
plop8,
fill7,
filo7,
foil7,
lipo6,
pill6,
poll6,
lilo4,
3 letter words:
iff9,
off9,
fop8,
pip7,
pop7,
fil6,
lip5,
lop5,
poi5,
pol5,
ill3,
oil3,
2 letter words:
if5,
of5,
op4,
pi4,
po4,
io2,
li2,
lo2,
oi2,
