potop[8], psoto[7], stopo[7], topos[7], towos[6],
post[6], psot[6], spot[6], stop[6], wtop[6], opos[5], ospo[5], stoo[5], sowo[4],
pop[5], pot[5], top[5], pst[5], osp[4], oto[4], sto[4], oso[3], owo[3],
op[3], po[3], ot[3], to[3], ts[3], os[2],
