bega[8], boga[8], bace[7], bece[7], baco[7], coba[7], obca[7], obce[7], obco[7],
beg[7], cab[6], cob[6], bee[5], abo[5], boa[5], oba[5], ago[5], ego[5],
ba[4], be[4], ag[4], bo[4], go[4], ce[3], co[3], ee[2], eo[2],
