null[6], lund[5], dult[5], rund[4], turn[4], dutt[4], tunt[4],
lud[4], dun[3], und[3], dur[3], nur[3], run[3], nut[3], tun[3], tut[3],
ul[3], du[2], ud[2], nu[2], ur[2], tu[2],
