bug[9], gub[9], bud[8], dug[8], bul[8], lub[8], gul[8], ulg[8], bum[8], umb[8], gum[8], lud[7], dum[7], mud[7], lum[7], mul[7], bun[7], gnu[7], bru[7], bur[7], gur[7], rug[7], dnu[6], nud[6], lnu[6], lun[6], nul[6], mun[6], dur[6], rud[6], urd[6], lur[6], mru[6], mur[6], rum[6], nur[5], run[5], urn[5],
bu[6], gu[6], ud[5], lu[5], ul[5], mu[5], nu[4],