bud[8], bun[7], bru[7], bur[7], bus[7], dnu[6], nud[6], dur[6], rud[6], urd[6], brr[5], nur[5], run[5], urn[5], rur[5], snu[5], rus[5], sur[5], drr[4],
bu[6], ud[5], nu[4], su[4],