4 letter words:
kipp12,
pouk10,
douk9,
kudo9,
doup7,
updo7,
3 letter words:
kip9,
kop9,
kid8,
koi7,
oik7,
ouk7,
pip7,
pop7,
pup7,
dip6,
dop6,
dup6,
pod6,
pud6,
oup5,
piu5,
poi5,
upo5,
dui4,
duo4,
oud4,
udo4,
2 letter words:
ki6,
ko6,
op4,
pi4,
po4,
up4,
di3,
do3,
id3,
od3,
io2,
oi2,
ou2,