loft[9], foul[9], flut[8], luft[8], tofu[8], duft[7], duld[5], dult[5],
oft[7], ufo[7], dol[5], lot[5], tod[4], lud[4], duo[4], out[4],
do[3], od[3], ul[3], du[2], ud[2], tu[2],
