trs trt tru try tsa tsc tsg tsi tsn tso tsr tss tst tsu tsy tta ttc ttg tti ttn tto ttr tts ttt ttu tty tua tuc tug tui tun tuo tur tus tut tuu tuy tya tyc tyg tyn tyo tyr tys tyt ua- uaa uac uag uai uan uao uar uas uat uau uay uca ucc ucg uci ucn uco ucr ucs uct ucu uga ugc ugg ugi ugn ugo ugr ugs ugt ugu uia uic uig uii uin uio uir uis uit uiu un- una unc ung uni unn uno unr uns unt unu uny uoa uoc uog uon uoo uor uos uot ur- ura urc urg uri urn uro urr urs urt uru ury usa usc usg usi usn uso usr uss ust usu uta utc uti utn uto utr uts utt utu uty uua uuc uug uun uur uus uut uuu uyc uyi uyo uys uyu yaa yac yag yai yan yao yar yas yat yau yay yca ycc yci yco ycs ycu ycy yga ygc ygo yig yii yin yio yir yis yit yna yng ynn yns ynu yny yoc yog yoi yon yoo yor yos yot you yoy yra yrc yrg yrn yro yrs yrt yru ysa ysc ysg ysi yso ysr yss yst ysu ysy yta ytc ytn yto ytr yts ytt ytu yua yug yui yun yuo yur yus yut yuu yuy yyc yyg yys yyt yyu yyy