c-- ccc ccp ccr ccs cct cpc cpp cpr cps cpt crc crp crr crs crt cry csc csp csr css cst csy ctc ctp ctr cts ctt cty cyc cyp cyr cys cyt p-p pcc pcp pcr pcs pct ppc ppp ppr pps ppt prc prp prr prs prt pry ps- psc psp psr pss pst psy pt- ptc ptp ptr pts ptt pty py- pyc pyr pys pyt rcc rcp rcr rcs rct rpc rpp rpr rps rpt rrc rrp rrr rrs rrt rsc rsp rsr rss rst rtc rtp rtr rts rtt rty ry- ryc ryr rys ryy scc scp scr scs sct spc spp spr sps spt spy sr- src srp srr srs srt sry ss- ssc ssp ssr sss sst stc stp str sts stt sty sy- syc syp syr sys syt tcc tcp tcr tcs tct tpc tpp tpr tps tpt trc trp trr trs trt try tsc tsp tsr tss tst tsy ttc ttp ttr tts ttt tty tyc typ tyr tys tyt ycc ycp ycs ycy yps yrc yrp yrs yrt ysc ysp ysr yss yst ysy ytc ytp ytr yts ytt yyc yys yyt yyy