ostom[7], stoom[7], mosso[6], sosom[6],
most[6], osom[5], somo[5], stoo[5], stos[5],
tom[5], omo[4], osm[4], som[4], oto[4], sto[4], tss[4], oso[3], sos[3],
om[3], ot[3], to[3], ts[3], os[2],
