c-- ccc cco ccp ccr ccs cct co- coc coo cop cor cos cot coy cpc cpo cpp cpr cps cpt crc cro crp crr crs crt cry csc cso csp csr css cst csy ctc cto ctp ctr cts ctt cty cyc cyo cyp cyr cys cyt oc- occ oco ocp ocr ocs oct oo- ooc ooo oop oor oos oot op- opc opo opp opr ops opt opy or- orc oro orp orr ors ort ory os- osc oso osp osr oss ost ot- otc oto otp otr ots ott oyo oys p-p pcc pco pcp pcr pcs pct poc poo pop por pos pot poy ppc ppo ppp ppr pps ppt prc pro prp prr prs prt pry ps- psc pso psp psr pss pst psy pt- ptc pto ptp ptr pts ptt pty py- pyc pyo pyr pys pyt rcc rco rcp rcr rcs rct roc roo rop ror ros rot roy rpc rpo rpp rpr rps rpt rrc rrp rrr rrs rrt rsc rso rsp rsr rss rst rtc rto rtp rtr rts rtt rty ry- ryc ryo ryr rys ryy scc sco scp scr scs sct soc soo sop sor sos sot soy spc spo spp spr sps spt spy sr- src sro srp srr srs srt sry ss- ssc sso ssp ssr sss sst stc sto stp str sts stt sty sy- syc syp syr sys syt tcc tco tcp tcr tcs tct to- toc too top tor tos tot toy tpc tpo tpp tpr tps tpt trc tro trp trr trs trt try tsc tso tsp tsr tss tst tsy ttc tto ttp ttr tts ttt tty tyc tyo typ tyr tys tyt ycc yco ycp ycs ycy yoc yoo yop yor yos yot yoy ypo yps yrc yro yrp yrs yrt ysc yso ysp ysr yss yst ysy ytc yto ytp ytr yts ytt yyc yys yyt yyy