-er c-- ccc ccd cce ccp ccr cct cdc cdd cde cdp cdr cdt ce- cec ced cee cep cer cet cpc cpd cpe cpp cpr cpt crc crd cre crp crr crt ctc ctd cte ctp ctr ctt dcc dcd dce dcp dcr dct ddc ddd dde ddp ddr ddt de- dec ded dee dep der det dpc dpd dpe dpp dpr dpt drc drd dre drp drr drt dtc dtd dte dtp dtr dtt ec- ecc ecd ece ecr ect ed- edc edd ede edp edr edt eec eed eee eep eer eet ep- epc epd epe epp epr ept erc erd ere erp err ert etc etd ete etp etr ett p-p pcc pcd pce pcp pcr pct pdc pdd pde pdp pdr pdt pec ped pee pep per pet ppc ppd ppe ppp ppr ppt prc prd pre prp prr prt pt- ptc ptd pte ptp ptr ptt rcc rcd rce rcp rcr rct rdc rdd rde rdp rdr rdt re- rec red ree rep rer ret rpc rpd rpe rpp rpr rpt rrc rrd rrp rrr rrt rtc rtd rte rtp rtr rtt tcc tcd tce tcp tcr tct tdc tdd tde tdp tdr tdt te- tec ted tee tep ter tet tpc tpd tpe tpp tpr tpt trc trd tre trp trr trt ttc ttd tte ttp ttr ttt