tara[4], trat[4], aura[4], raut[4], trau[4], urat[4], taut[4],
aar[3], ara[3], rar[3], art[3], rat[3], tat[3], aua[3], rau[3], tau[3], tut[3],
aa[2], ar[2], au[2], ur[2], tu[2],