bum[8], umb[8], obu[7], bym[7], amb[6], bam[6], bom[6], mob[6], aby[6], boy[6], oby[6], abo[5], boa[5], oba[5], may[5], yam[5], omy[5], moa[4], oma[4],
bu[6], mu[5], by[5], ba[4], bo[4], au[4], my[4], ma[3], om[3],