-er c-- ccc ccd cce cco ccp ccr cct ccx cdc cdd cde cdo cdp cdr cdt cdx ce- cec ced cee ceo cep cer cet cex co- coc cod coe coo cop cor cot cox cpc cpd cpe cpo cpp cpr cpt cpx crc crd cre cro crp crr crt crx ctc ctd cte cto ctp ctr ctt ctx cxc cxo cxp cxr cxt cxx dcc dcd dce dco dcp dcr dct dcx ddc ddd dde ddo ddp ddr ddt ddx de- dec ded dee deo dep der det dex doc dod doe doo dop dor dot dox dpc dpd dpe dpo dpp dpr dpt drc drd dre dro drp drr drt drx dtc dtd dte dto dtp dtr dtt dtx dxc dxd dxo dxp dxr dxt dxx ec- ecc ecd ece eco ecr ect ecx ed- edc edd ede edo edp edr edt edx eec eed eee eeo eep eer eet eex eo- eoc eod eoe eoo eop eor eot ep- epc epd epe epo epp epr ept epx erc erd ere ero erp err ert etc etd ete eto etp etr ett etx ex- exc exd exe exo exp exr ext exx oc- occ ocd oco ocp ocr oct ocx odc odd ode odo odp odr odt oec oed oee oeo oep oer oet oex oo- ooc ood ooo oop oor oot oox op- opc opd ope opo opp opr opt opx or- orc ord ore oro orp orr ort orx ot- otc otd ote oto otp otr ott ox- oxc oxo oxt oxx p-p pcc pcd pce pco pcp pcr pct pcx pdc pdd pde pdo pdp pdr pdt pdx pec ped pee peo pep per pet pex poc pod poe poo pop por pot pox ppc ppd ppe ppo ppp ppr ppt ppx prc prd pre pro prp prr prt prx pt- ptc ptd pte pto ptp ptr ptt ptx pxc pxe pxr pxt rcc rcd rce rco rcp rcr rct rcx rdc rdd rde rdo rdp rdr rdt rdx re- rec red ree reo rep rer ret rex roc rod roe roo rop ror rot rox rpc rpd rpe rpo rpp rpr rpt rpx rrc rrd rrp rrr rrt rtc rtd rte rto rtp rtr rtt rtx rxp rxr t-x tcc tcd tce tco tcp tcr tct tcx tdc tdd tde tdo tdp tdr tdt tdx te- tec ted tee teo tep ter tet tex to- toc tod toe too top tor tot tox tpc tpd tpe tpo tpp tpr tpt tpx trc trd tre tro trp trr trt trx ttc ttd tte tto ttp ttr ttt ttx txe txt xcd xcp xcr xcx xdc xde xdr xdt xed xee xep xer xet xex xoc xod xoo xop xor xot xox xpc xpd xpe xpo xpp xpt xrc xrd xrt xrx xtc xtp xtr xtx xxo xxp xxx