abba[8], baba[8], abbo[8], babo[8], boba[8], obab[8], bobo[8], abat[7], bata[7], bota[7], boot[7], tata[6], tato[6], toto[6],
bab[7], bob[7], bat[6], tab[6], bot[6], abo[5], boa[5], oba[5], ata[4], tao[4], oto[4],
ba[4], bo[4], at[3], ta[3], ot[3], to[3], aa[2],
