feber[10], feder[8], fedre[8], beerd[7], bered[7], derbe[7], beere[7], reede[5],
bede[6], derb[6], eber[6], erbe[6], rebe[6], erde[4], rede[4],
fee[6], erb[5], der[3], erd[3], red[3], ree[3],
er[2], re[2],
