spy sr- srb src sre sri srm sro srp srr srs sry ss- ssb ssc sse ssi ssm sso ssp ssr sss ssu sub suc sue sui sum suo sup sur sus suu suy sy- syb syc sye syi sym syp syr sys syu ubb ubc ube ubi ubo ubp ubr ubs ubu uby ucb ucc uce uci ucm uco ucp ucr ucs ucu ueb uec uee uei uem uep uer ues uey uib uic uie uii uim uio uip uir uis uiu um- umb umc ume umi umm umo ump umr ums umu uob uoc uoe uom uoo uop uor uos up- upb upc upe upi upm upo upp upr ups upu ur- urb urc ure uri urm uro urp urr urs uru ury usb usc use usi usm uso usp usr uss usu uuc uue uum uur uus uuu uyc uyi uyo uys uyu ybc ybe ybi ybm ybp ybr ybs yby ycc yce yci yco ycp ycs ycu ycy yeb yec yee yei yem yeo yep yer yes yey yie yii yim yio yip yir yis ymc yme ymi ymm ymo yms yob yoc yoe yoi yom yoo yop yor yos you yoy ypo yps ypu yrc yre yro yrp yrs yru ysb ysc yse ysi ysm yso ysp ysr yss ysu ysy yue yui yum yuo yup yur yus yuu yuy yyb yyc yye yys yyu yyy