6 letter words:
tifosi9,
5 letter words:
foist8,
4 letter words:
fist7,
fits7,
sift7,
soft7,
isit4,
3 letter words:
fit6,
ifs6,
oft6,
sif6,
ios3,
iso3,
its3,
sit3,
sot3,
tis3,
2 letter words:
if5,
of5,
io2,
is2,
it2,
oi2,
os2,
si2,
so2,
st2,
ti2,
to2,
