c-- ccc cco ccr ccs cct ccu co- coc coo cor cos cot cou coy crc cro crr crs crt cru cry csc cso csr css cst csu csy ctc cto ctr cts ctt ctu cty cuc cuo cur cus cut cuu cuy cyc cyo cyr cys cyt oc- occ oco ocr ocs oct ocu oo- ooc ooo oor oos oot or- orc oro orr ors ort oru ory os- osc oso osr oss ost osu ot- otc oto otr ots ott otu ou- ouc ouo our ous out oyo oys rcc rco rcr rcs rct rcu roc roo ror ros rot rou roy rrc rrr rrs rrt rru rsc rso rsr rss rst rsu rtc rto rtr rts rtt rtu rty ruc ruo rur rus rut ruu ruy ry- ryc ryo ryr rys ryu ryy scc sco scr scs sct scu soc soo sor sos sot sou soy sr- src sro srr srs srt sry ss- ssc sso ssr sss sst ssu stc sto str sts stt stu sty suc suo sur sus sut suu suy sy- syc syr sys syt syu tcc tco tcr tcs tct tcu to- toc too tor tos tot tou toy trc tro trr trs trt tru try tsc tso tsr tss tst tsu tsy ttc tto ttr tts ttt ttu tty tuc tuo tur tus tut tuu tuy tyc tyo tyr tys tyt ucc uco ucr ucs uct ucu uoc uoo uor uos uot ur- urc uro urr urs urt uru ury usc uso usr uss ust usu utc uto utr uts utt utu uty uuc uur uus uut uuu uyc uyo uys uyu ycc yco ycs ycu ycy yoc yoo yor yos yot you yoy yrc yro yrs yrt yru ysc yso ysr yss yst ysu ysy ytc yto ytr yts ytt ytu yuo yur yus yut yuu yuy yyc yys yyt yyu yyy