-er c-- ccc ccd cce ccp ccr ccs cct cdc cdd cde cdp cdr cds cdt ce- cec ced cee cep cer ces cet cpc cpd cpe cpp cpr cps cpt crc crd cre crp crr crs crt csc csd cse csp csr css cst ctc ctd cte ctp ctr cts ctt dcc dcd dce dcp dcr dcs dct ddc ddd dde ddp ddr dds ddt de- dec ded dee dep der des det dpc dpd dpe dpp dpr dps dpt drc drd dre drp drr drs drt dsc dsd dse dsp dsr dss dst dtc dtd dte dtp dtr dts dtt ec- ecc ecd ece ecr ecs ect ed- edc edd ede edp edr eds edt eec eed eee eep eer ees eet ep- epc epd epe epp epr eps ept erc erd ere erp err ers ert es- esc esd ese esp esr ess est etc etd ete etp etr ets ett p-p pcc pcd pce pcp pcr pcs pct pdc pdd pde pdp pdr pds pdt pec ped pee pep per pes pet ppc ppd ppe ppp ppr pps ppt prc prd pre prp prr prs prt ps- psc psd pse psp psr pss pst pt- ptc ptd pte ptp ptr pts ptt rcc rcd rce rcp rcr rcs rct rdc rdd rde rdp rdr rds rdt re- rec red ree rep rer res ret rpc rpd rpe rpp rpr rps rpt rrc rrd rrp rrr rrs rrt rsc rsd rse rsp rsr rss rst rtc rtd rte rtp rtr rts rtt scc scd sce scp scr scs sct sdc sdd sde sdp sdr sds sdt se- sec sed see sep ser ses set spc spd spe spp spr sps spt sr- src srd sre srp srr srs srt ss- ssc ssd sse ssp ssr sss sst stc std ste stp str sts stt tcc tcd tce tcp tcr tcs tct tdc tdd tde tdp tdr tds tdt te- tec ted tee tep ter tes tet tpc tpd tpe tpp tpr tps tpt trc trd tre trp trr trs trt tsc tsd tse tsp tsr tss tst ttc ttd tte ttp ttr tts ttt