7 letter words:
strifts10,
6 letter words:
firsts9,
frists9,
fritts9,
strift9,
5 letter words:
first8,
fists8,
fitts8,
frist8,
frits8,
fritt8,
rifts8,
sifts8,
tifts8,
ritts5,
stirs5,
trist5,
4 letter words:
firs7,
fist7,
fits7,
fitt7,
fris7,
frit7,
rifs7,
rift7,
sift7,
tift7,
rits4,
ritt4,
sirs4,
sist4,
sits4,
sris4,
stir4,
tits4,
3 letter words:
fir6,
fit6,
ifs6,
rif6,
sif6,
its3,
rit3,
sir3,
sis3,
sit3,
sri3,
tis3,
tit3,
2 letter words:
if5,
is2,
it2,
si2,
st2,
ti2,
