duff[10], tuff[10], fund[7], duft[7], furt[7], ruft[7], turf[7], rund[4], turn[4],
uff[9], fun[6], ruf[6], dun[3], und[3], dur[3], nur[3], run[3], nut[3], tun[3],
du[2], ud[2], nu[2], ur[2], tu[2],
