bub[9], bug[9], gub[9], bun[7], gnu[7], bru[7], bur[7], gur[7], rug[7], bus[7], nur[5], run[5], urn[5], snu[5], rus[5], sur[5], wun[5], suw[5],
bu[6], gu[6], nu[4], su[4], wu[4],