bum[8], umb[8], bun[7], bru[7], bur[7], bus[7], mun[6], mru[6], mur[6], rum[6], mus[6], sum[6], nur[5], run[5], urn[5], snu[5], rus[5], sur[5],
bu[6], mu[5], nu[4], su[4],
