fru[9], fur[9], ruf[9], ref[7], edu[6], ued[6], dur[6], rud[6], urd[6], dwu[6], der[4], red[4], rew[3], wre[3],
fu[8], uf[8], ef[6], fe[6], ud[5], wu[4], de[3], er[2], re[2], ew[2], we[2],
