toto[6], dato[5], auto[5], daut[4], taut[4], dutt[4],
tao[4], tod[4], tot[4], duo[4], out[4], tat[3], dau[3], tau[3], tut[3],
do[3], od[3], ad[2], da[2], au[2], du[2], ud[2], tu[2],
