4 letter words:
dops7,
pods7,
spod7,
opts6,
post6,
pots6,
spot6,
stop6,
tops6,
dost5,
dots5,
tods5,
3 letter words:
dop6,
pod6,
ops5,
opt5,
pos5,
pot5,
pst5,
sop5,
top5,
dos4,
dot4,
dso4,
ods4,
sod4,
tod4,
sot3,
2 letter words:
op4,
po4,
do3,
od3,
os2,
so2,
st2,
to2,