luder[6], ludre[6], rudel[6], ruder[5], rudre[5],
lude[5], lure[5],
lud[4], leu[4], der[3], erd[3], red[3], dur[3], reu[3], ure[3],
ul[3], er[2], re[2], du[2], ud[2], ur[2],
