druk[8], dury[8], rudy[8], udry[8], urdy[8], kury[8], ryku[8], durr[7], rury[7],
kyu[7], dur[6], rud[6], urd[6], kur[6], rur[5], kry[5], ryk[5], drr[4],
ud[5], ku[5],
