bomb[9], abba[8], baba[8], abbo[8], babo[8], boba[8], obab[8], amba[7], ambo[7],
bab[7], bob[7], amb[6], bam[6], bom[6], mob[6], abo[5], boa[5], oba[5], maa[4], moa[4], oma[4], aaa[3],
ba[4], bo[4], ma[3], om[3], aa[2],