firn[7], furt[7], ruft[7], turf[7], irrt[4], ruin[4], urin[4], turn[4],
fit[6], fun[6], ruf[6], irr[3], uni[3], nur[3], run[3], nut[3], tun[3],
in[2], ti[2], ui[2], nu[2], ur[2], tu[2],
