boga[8], baca[7], caba[7], baco[7], coba[7], obca[7], obco[7], caca[6],
cab[6], cob[6], aga[5], abo[5], boa[5], oba[5], ago[5],
ba[4], ag[4], bo[4], go[4], co[3], aa[2],
