4 letter words:
bisk10,
boks10,
bosk10,
kobs10,
kois8,
oiks8,
skio8,
bios6,
bois6,
obis6,
3 letter words:
bok9,
kob9,
kis7,
koi7,
kos7,
oik7,
sik7,
ski7,
bio5,
bis5,
boi5,
bos5,
obi5,
obs5,
sib5,
sob5,
ios3,
iso3,
2 letter words:
ki6,
ko6,
bi4,
bo4,
ob4,
io2,
is2,
oi2,
os2,
si2,
so2,