eifer[8], eifre[8], feier[8], feire[8], fiere[8], freie[8], reife[8], riefe[8], frier[8],
feie[7], fier[7], frei[7], reif[7], rief[7], eier[4], eire[4], irre[4],
fee[6], fei[6], ree[3], ire[3], irr[3],
ei[2], er[2], re[2],
