bulw[9], brus[8], burs[8],
buc[8], bul[8], lub[8], bru[7], bur[7], bus[7], cru[6], lur[6], lwu[6], ulw[6], rus[5], sur[5], suw[5],
bu[6], lu[5], ul[5], su[4], wu[4],
