tgtc tkac tkkg traa trac trae trag trak trat trau trca trcc tre- trea trec tree treg trek tret treu trge trra trtc trte trtr truc true trug truk trut truu tter ttkg tttt tuae tuak tuar tuat tuca tucc tuck tuer tuet tuga tugg tugu tuka tuke tura turc ture turg turk turr turt turu tuta tute tutt tutu uaca uarc uart uaru uata uatu uaua ucak ucar ucat ucca ucea ucka ucrc ucua ucut ugar ugcc ugcg uggt ugra ugta ugur uguu ukcc ukek ukeu ukra ukrc ukta ukur urac urat urau urca ure- urea uret urga urge urgu urka urke urra urre urte uruk urur urut utac utau utec uter uttu utug uuta uuuu