c-- ccc ccp ccr ccs cct cpc cpp cpr cps cpt crc crp crr crs crt csc csp csr css cst ctc ctp ctr cts ctt p-p pcc pcp pcr pcs pct ppc ppp ppr pps ppt prc prp prr prs prt ps- psc psp psr pss pst pt- ptc ptp ptr pts ptt 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 scc scp scr scs sct spc spp spr sps spt sr- src srp srr srs srt ss- ssc ssp ssr sss sst stc stp str sts stt tcc tcp tcr tcs tct tpc tpp tpr tps tpt trc trp trr trs trt tsc tsp tsr tss tst ttc ttp ttr tts ttt