tsg tsn tso tsr tss tst tsu tsy ttb ttc tte ttg ttn tto ttr tts ttt ttu tty tub tuc tue tug tun tuo tur tus tut tuu tuy tyc tye tyg tyn tyo tyr tys tyt ubb ubc ube ubg ubn ubo ubr ubs ubt ubu uby ucb ucc uce ucg ucn uco ucr ucs uct ucu ueb uec uee ueg uen uer ues uet uey ugb ugc uge ugg ugn ugo ugr ugs ugt ugu un- unb unc une ung unn uno unr uns unt unu uny uob uoc uoe uog uon uoo uor uos uot ur- urb urc ure urg urn uro urr urs urt uru ury usb usc use usg usn uso usr uss ust usu utb utc ute utn uto utr uts utt utu uty uuc uue uug uun uur uus uut uuu uyc uyo uys uyu ybc ybe ybg ybr ybs yby ycc yce yco ycs ycu ycy yeb yec yee yeg yen yeo yer yes yet yey ygc ygo yne yng ynn yns ynu yny yob yoc yoe yog yon yoo yor yos yot you yoy yrc yre yrg yrn yro yrs yrt yru ysb ysc yse ysg yso ysr yss yst ysu ysy ytc yte ytn yto ytr yts ytt ytu yue yug yun yuo yur yus yut yuu yuy yyb yyc yye yyg yys yyt yyu yyy