-er c-- ccc ccd cce ccp ccr cct ccx cdc cdd cde cdp cdr cdt cdx ce- cec ced cee cep cer cet cex cpc cpd cpe cpp cpr cpt cpx crc crd cre crp crr crt crx ctc ctd cte ctp ctr ctt ctx cxc cxp cxr cxt cxx dcc dcd dce dcp dcr dct dcx ddc ddd dde ddp ddr ddt ddx de- dec ded dee dep der det dex dpc dpd dpe dpp dpr dpt drc drd dre drp drr drt drx dtc dtd dte dtp dtr dtt dtx dxc dxd dxp dxr dxt dxx ec- ecc ecd ece ecr ect ecx ed- edc edd ede edp edr edt edx eec eed eee eep eer eet eex ep- epc epd epe epp epr ept epx erc erd ere erp err ert etc etd ete etp etr ett etx ex- exc exd exe exp exr ext exx p-p pcc pcd pce pcp pcr pct pcx pdc pdd pde pdp pdr pdt pdx pec ped pee pep per pet pex ppc ppd ppe ppp ppr ppt ppx prc prd pre prp prr prt prx pt- ptc ptd pte ptp ptr ptt ptx pxc pxe pxr pxt rcc rcd rce rcp rcr rct rcx rdc rdd rde rdp rdr rdt rdx re- rec red ree rep rer ret rex rpc rpd rpe rpp rpr rpt rpx rrc rrd rrp rrr rrt rtc rtd rte rtp rtr rtt rtx rxp rxr t-x tcc tcd tce tcp tcr tct tcx tdc tdd tde tdp tdr tdt tdx te- tec ted tee tep ter tet tex tpc tpd tpe tpp tpr tpt tpx trc trd tre trp trr trt trx ttc ttd tte ttp ttr ttt ttx txe txt xcd xcp xcr xcx xdc xde xdr xdt xed xee xep xer xet xex xpc xpd xpe xpp xpt xrc xrd xrt xrx xtc xtp xtr xtx xxp xxx