bomb[9], abbo[8], babo[8], boba[8], obab[8], ambo[7],
bab[7], bob[7], amb[6], bam[6], bom[6], mob[6], abo[5], boa[5], oba[5], moa[4], oma[4],
ba[4], bo[4], ma[3], om[3],