fere[8], free[8], gder[7], dece[6], cedr[6], cred[6], erce[5],
fee[7], ref[7], frr[7], erg[5], cer[4], der[4], red[4], drr[4],
ef[6], fe[6], ce[3], de[3], ee[2], er[2], re[2],
