buca[9], buce[9], baca[7], caba[7], bace[7], bece[7], baco[7], coba[7], obca[7], obce[7],
buc[8], obu[7], cab[6], cob[6], ecu[6], bee[5], abo[5], boa[5], oba[5], aua[5],
bu[6], ba[4], be[4], bo[4], au[4], ce[3], co[3], aa[2], ee[2], eo[2],
