6 letter words:
biffos14,
5 letter words:
biffo13,
biffs13,
boffs13,
4 letter words:
biff12,
boff12,
offs10,
fibs9,
fobs9,
bios6,
bois6,
obis6,
3 letter words:
iff9,
off9,
fib8,
fob8,
ifs6,
sif6,
bio5,
bis5,
boi5,
bos5,
obi5,
obs5,
sib5,
sob5,
ios3,
iso3,
2 letter words:
if5,
of5,
bi4,
bo4,
ob4,
io2,
is2,
oi2,
os2,
si2,
so2,
