c-- ccc ccd ccf cco ccp ccr ccs cdc cdd cdf cdo cdp cdr cds cfc cfd cff cfo cfp cfr cfs co- coc cod cof coo cop cor cos cpc cpd cpf cpo cpp cpr cps crc crd crf cro crp crr crs csc csd csf cso csp csr css dcc dcd dcf dco dcp dcr dcs ddc ddd ddf ddo ddp ddr dds dfc dfd dff dfo dfp dfr dfs doc dod dof doo dop dor dos dpc dpd dpf dpo dpp dpr dps drc drd dro drp drr drs dsc dsd dsf dso dsp dsr dss fcc fcd fcf fco fcp fcr fcs fdc fdd fdf fdo fdp fdr fds ffc ffd fff ffo ffp ffr ffs foc fof foo fop for fos fpc fpd fpo fpp fpr fps frc frd frf fro frp frr frs fsc fsd fsf fso fsp fsr fss oc- occ ocd ocf oco ocp ocr ocs odc odd odf odo odp odr ods of- ofc ofd off ofo ofp ofr ofs oo- ooc ood oof ooo oop oor oos op- opc opd opf opo opp opr ops or- orc ord orf oro orp orr ors os- osc osd osf oso osp osr oss p-p pcc pcd pcf pco pcp pcr pcs pdc pdd pdf pdo pdp pdr pds pfc pfd pff pfo pfp pfr pfs poc pod pof poo pop por pos ppc ppd ppf ppo ppp ppr pps prc prd prf pro prp prr prs ps- psc psd psf pso psp psr pss rcc rcd rcf rco rcp rcr rcs rdc rdd rdf rdo rdp rdr rds rfc rfd rff rfo rfp rfr rfs roc rod rof roo rop ror ros rpc rpd rpf rpo rpp rpr rps rrc rrd rrf rrp rrr rrs rsc rsd rsf rso rsp rsr rss scc scd scf sco scp scr scs sdc sdd sdf sdo sdp sdr sds sfc sfd sff sfo sfp sfr sfs soc sod sof soo sop sor sos spc spd spf spo spp spr sps sr- src srd srf sro srp srr srs ss- ssc ssd ssf sso ssp ssr sss