-er c-- ccc ccd cce cco ccp ccr ccs cdc cdd cde cdo cdp cdr cds ce- cec ced cee ceo cep cer ces co- coc cod coe coo cop cor cos cpc cpd cpe cpo cpp cpr cps crc crd cre cro crp crr crs csc csd cse cso csp csr css dcc dcd dce dco dcp dcr dcs ddc ddd dde ddo ddp ddr dds de- dec ded dee deo dep der des doc dod doe doo dop dor dos dpc dpd dpe dpo dpp dpr dps drc drd dre dro drp drr drs dsc dsd dse dso dsp dsr dss ec- ecc ecd ece eco ecr ecs ed- edc edd ede edo edp edr eds eec eed eee eeo eep eer ees eo- eoc eod eoe eoo eop eor eos ep- epc epd epe epo epp epr eps erc erd ere ero erp err ers es- esc esd ese eso esp esr ess oc- occ ocd oco ocp ocr ocs odc odd ode odo odp odr ods oec oed oee oeo oep oer oes oo- ooc ood ooo oop oor oos op- opc opd ope opo opp opr ops or- orc ord ore oro orp orr ors os- osc osd ose oso osp osr oss p-p pcc pcd pce pco pcp pcr pcs pdc pdd pde pdo pdp pdr pds pec ped pee peo pep per pes poc pod poe poo pop por pos ppc ppd ppe ppo ppp ppr pps prc prd pre pro prp prr prs ps- psc psd pse pso psp psr pss rcc rcd rce rco rcp rcr rcs rdc rdd rde rdo rdp rdr rds re- rec red ree reo rep rer res roc rod roe roo rop ror ros rpc rpd rpe rpo rpp rpr rps rrc rrd rrp rrr rrs rsc rsd rse rso rsp rsr rss scc scd sce sco scp scr scs sdc sdd sde sdo sdp sdr sds se- sec sed see seo sep ser ses soc sod soe soo sop sor sos spc spd spe spo spp spr sps sr- src srd sre sro srp srr srs ss- ssc ssd sse sso ssp ssr sss