c-- ccc ccf cco ccp ccr cct cfc cff cfo cfp cfr cft co- coc cof coo cop cor cot cpc cpf cpo cpp cpr cpt crc crf cro crp crr crt ctc ctf cto ctp ctr ctt fcc fcf fco fcp fcr fct ffc fff ffo ffp ffr fft foc fof foo fop for fot fpc fpo fpp fpr fpt frc frf fro frp frr frt ftc ftf fto ftp ftr ftt oc- occ ocf oco ocp ocr oct of- ofc off ofo ofp ofr oft oo- ooc oof ooo oop oor oot op- opc opf opo opp opr opt or- orc orf oro orp orr ort ot- otc otf oto otp otr ott p-p pcc pcf pco pcp pcr pct pfc pff pfo pfp pfr pft poc pof poo pop por pot ppc ppf ppo ppp ppr ppt prc prf pro prp prr prt pt- ptc ptf pto ptp ptr ptt rcc rcf rco rcp rcr rct rfc rff rfo rfp rfr rft roc rof roo rop ror rot rpc rpf rpo rpp rpr rpt rrc rrf rrp rrr rrt rtc rtf rto rtp rtr rtt tcc tcf tco tcp tcr tct tfc tff tfo tfp tfr tft to- toc tof too top tor tot tpc tpf tpo tpp tpr tpt trc trf tro trp trr trt ttc ttf tto ttp ttr ttt