c-- ccc ccr ccs cct ccu crc crr crs crt cru cry csc csr css cst csu csy ctc ctr cts ctt ctu cty cuc cur cus cut cuu cuy cyc cyr cys cyt rcc rcr rcs rct rcu rrc rrr rrs rrt rru rsc rsr rss rst rsu rtc rtr rts rtt rtu rty ruc rur rus rut ruu ruy ry- ryc ryr rys ryu ryy scc scr scs sct scu sr- src srr srs srt sry ss- ssc ssr sss sst ssu stc str sts stt stu sty suc sur sus sut suu suy sy- syc syr sys syt syu tcc tcr tcs tct tcu trc trr trs trt tru try tsc tsr tss tst tsu tsy ttc ttr tts ttt ttu tty tuc tur tus tut tuu tuy tyc tyr tys tyt ucc ucr ucs uct ucu ur- urc urr urs urt uru ury usc usr uss ust usu utc utr uts utt utu uty uuc uur uus uut uuu uyc uys uyu ycc ycs ycu ycy yrc yrs yrt yru ysc ysr yss yst ysu ysy ytc ytr yts ytt ytu yur yus yut yuu yuy yyc yys yyt yyu yyy