abbo[8], babo[8], boba[8], obab[8], bace[7], baco[7], coba[7], obca[7], doba[7], obce[7], coda[6],
bab[7], bob[7], cab[6], bad[6], dba[6], cob[6], bod[6], abo[5], boa[5], oba[5], cod[5], doc[5], dao[4], oda[4], deo[4], ode[4],
ba[4], be[4], bo[4], ad[3], da[3], ce[3], de[3], co[3], do[3], od[3], eo[2],
