fein[7], nife[7], fier[7], frei[7], reif[7], rief[7], fern[7], firn[7], iren[4], rein[4],
fei[6], ein[3], nie[3], ire[3], ern[3], ren[3],
ei[2], ne[2], in[2], er[2], re[2],
