poco[6], post[6], psot[6], spot[6], stop[6], wtop[6], opos[5], ospo[5], stoo[5], owco[5], owoc[5], sowo[4],
pot[5], top[5], pst[5], soc[4], osp[4], oto[4], sto[4], oso[3], owo[3],
co[3], op[3], po[3], ot[3], to[3], ts[3], os[2],
