5 letter words:
treks9,
terts5,
trest5,
trets5,
4 letter words:
keks12,
erks8,
kest8,
kets8,
sekt8,
serk8,
sker8,
sket8,
trek8,
erst4,
rest4,
rets4,
sett4,
stet4,
test4,
tets4,
tres4,
tret4,
3 letter words:
erk7,
ket7,
tsk7,
ers3,
est3,
res3,
ret3,
ser3,
set3,
tes3,
tet3,
2 letter words:
er2,
es2,
et2,
re2,
st2,
te2,