c-- ccc ccd cck cco ccp ccr ccs cdc cdd cdk cdo cdp cdr cds ckc ckd cko cks co- coc cod cok coo cop cor cos cpc cpd cpk cpo cpp cpr cps crc crd crk cro crp crr crs csc csd csk cso csp csr css dcc dcd dck dco dcp dcr dcs ddc ddd ddk ddo ddp ddr dds dkc dkk dko dkp dkr dks doc dod dok doo dop dor dos dpc dpd dpk dpo dpp dpr dps drc drd drk dro drp drr drs dsc dsd dsk dso dsp dsr dss kcc kcd kck kcp kcr kcs kdc kdk kdo kdp kdr kds kkc kkk kkp kkr kks koc kod kok koo kop kor kos kpc kpd kpk kpo kpp kpr kps krc krd krk kro krp krr krs ksc ksd ksk kso ksp ksr kss oc- occ ocd ock oco ocp ocr ocs odc odd odo odp odr ods okc okd okk oko okp okr oks oo- ooc ood ook ooo oop oor oos op- opc opd opk opo opp opr ops or- orc ord ork oro orp orr ors os- osc osd osk oso osp osr oss p-p pcc pcd pck pco pcp pcr pcs pdc pdd pdk pdo pdp pdr pds pkc pkd pko pkp pkr pks poc pod pok poo pop por pos ppc ppd ppk ppo ppp ppr pps prc prd prk pro prp prr prs ps- psc psd psk pso psp psr pss rcc rcd rco rcp rcr rcs rdc rdd rdo rdp rdr rds rkc rkk rko rkp rks roc rod rok roo rop ror ros rpc rpd rpk rpo rpp rpr rps rrc rrd rrk rrp rrr rrs rsc rsd rsk rso rsp rsr rss scc scd sck sco scp scr scs sdc sdd sdk sdo sdp sdr sds sk- skc skd skk sko skp skr sks soc sod sok soo sop sor sos spc spd spk spo spp spr sps sr- src srd srk sro srp srr srs ss- ssc ssd ssk sso ssp ssr sss