potop[8],
popu[8], pupo[8], otup[8], potu[8], topu[8], utop[8],
pup[7], tup[7], opu[6], out[6], uto[6], pop[5], pot[5], top[5], oto[4],
tu[5], ut[5], op[3], po[3], ot[3], to[3],
