refu[10], duce[8], ceru[7], rude[7], cedr[6], cred[6],
fru[9], fur[9], ruf[9], ref[7], cud[7], ecu[6], edu[6], ued[6], cru[6], dur[6], rud[6], urd[6], cer[4], der[4], red[4],
fu[8], uf[8], ef[6], fe[6], ud[5], ce[3], de[3], er[2], re[2],
