baca[7], caba[7], baco[7], coba[7], obca[7], abat[7], bata[7], bota[7], taca[6], taco[6], tata[6], tato[6],
cab[6], cob[6], bat[6], tab[6], bot[6], abo[5], boa[5], oba[5], tac[5], ata[4], tao[4],
ba[4], bo[4], co[3], at[3], ta[3], ot[3], to[3], aa[2],
