sude[4], sure[4], ures[4], user[4], urdu[4],
der[3], erd[3], red[3], des[3], ers[3], res[3], dur[3], reu[3], ure[3], sud[3], uds[3], rus[3], sur[3], urs[3],
er[2], re[2], es[2], du[2], ud[2], ur[2],
