buc[8], bun[7], obu[7], bru[7], bur[7], cob[6], cru[6], bon[5], bor[5], rob[5], nur[5], run[5], urn[5], oru[5], noc[4], nor[3],
bu[6], bo[4], nu[4], co[3], no[2], on[2], or[2], ro[2],
