ambu[9], umba[9], mamb[8], umma[8], memu[8], ameb[7],
bum[8], umb[8], umm[7], amb[6], bam[6], emu[6], bee[5], mam[5], mem[5], mee[4],
bu[6], mu[5], ba[4], be[4], au[4], ma[3], em[3], me[3], ee[2],
