fern[7], senf[7], cers[7], nerd[4], send[4], rens[4],
cer[6], ces[6], sec[6], fes[6], den[3], end[3], der[3], erd[3], red[3], ern[3], ren[3], des[3], sen[3], ers[3], res[3],
ne[2], er[2], re[2], es[2],
