oo- ooo oor oos oot or- oro orr ors ort oru ory os- oso osr oss ost osu ot- oto otr ots ott otu ou- ouo our ous out oyo oys roo ror ros rot rou roy rrr rrs rrt rru rso rsr rss rst rsu rto rtr rts rtt rtu rty ruo rur rus rut ruu ruy ry- ryo ryr rys ryu ryy soo sor sos sot sou soy sr- sro srr srs srt sry ss- sso ssr sss sst ssu sto str sts stt stu sty suo sur sus sut suu suy sy- syr sys syt syu to- too tor tos tot tou toy tro trr trs trt tru try tso tsr tss tst tsu tsy tto ttr tts ttt ttu tty tuo tur tus tut tuu tuy tyo tyr tys tyt uoo uor uos uot ur- uro urr urs urt uru ury uso usr uss ust usu uto utr uts utt utu uty uur uus uut uuu uyo uys uyu yoo yor yos yot you yoy yro yrs yrt yru yso ysr yss yst ysu ysy yto ytr yts ytt ytu yuo yur yus yut yuu yuy yys yyt yyu yyy