tte ttg ttl ttm tto ttp ttr ttt ttu tty tuc tue tug tul tum tuo tup tur tut tuu tuy tyc tye tyg tyl tym tyo typ tyr tyt ucc uce ucg ucl ucm uco ucp ucr uct ucu uec uee ueg uel uem uep uer uet uey ugc uge ugg ugl ugm ugo ugp ugr ugt ugu ulc ule ulg ull ulm ulo ulp ulr ult ulu uly um- umc ume umg uml umm umo ump umr umt umu uoc uoe uog uol uom uoo uop uor uot up- upc upe upg upm upo upp upr upt upu ur- urc ure urg url urm uro urp urr urt uru ury utc ute utl utm uto utp utr utt utu uty uuc uue uug uum uur uut uuu uyc uyo uyu ycc yce ycl yco ycp ycu ycy yec yee yeg yel yem yeo yep yer yet yey ygc ygl ygm ygo ylc yle ylg yll ylm ylr ylt yly ymc yme ymg yml ymm ymo ymt yoc yoe yog yol yom yoo yop yor yot you yoy ypg ypl ypo ypu yrc yre yrg yro yrp yrt yru ytc yte ytl ytm yto ytp ytr ytt ytu yue yug yul yum yuo yup yur yut yuu yuy yyc yye yyg yyt yyu yyy