-er c-- ccc ccd cce cco ccp ccr cct ccv cdc cdd cde cdo cdp cdr cdt cdv ce- cec ced cee ceo cep cer cet cev co- coc cod coe coo cop cor cot cov cpc cpd cpe cpo cpp cpr cpt cpv crc crd cre cro crp crr crt crv ctc ctd cte cto ctp ctr ctt ctv cvc cvd cve cvo cvp cvr cvt cvv dcc dcd dce dco dcp dcr dct dcv ddc ddd dde ddo ddp ddr ddt de- dec ded dee deo dep der det dev doc dod doe doo dop dor dot dov dpc dpd dpe dpo dpp dpr dpt dpv drc drd dre dro drp drr drt drv dtc dtd dte dto dtp dtr dtt dtv dvc dvd dve dvp dvr dvt ec- ecc ecd ece eco ecr ect ecv ed- edc edd ede edo edp edr edt eec eed eee eeo eep eer eet eev eo- eoc eod eoe eoo eop eor eot ep- epc epd epe epo epp epr ept erc erd ere ero erp err ert erv etc etd ete eto etp etr ett etv evc evd eve evo evp evr evt evv oc- occ ocd oco ocp ocr oct ocv odc odd ode odo odp odr odt odv oec oed oee oeo oep oer oet oo- ooc ood ooo oop oor oot oov op- opc opd ope opo opp opr opt opv or- orc ord ore oro orp orr ort orv ot- otc otd ote oto otp otr ott otv ov- ovc ovd ove ovo ovp ovv p-p pcc pcd pce pco pcp pcr pct pcv pdc pdd pde pdo pdp pdr pdt pdv pec ped pee peo pep per pet pev poc pod poe poo pop por pot pov ppc ppd ppe ppo ppp ppr ppt ppv prc prd pre pro prp prr prt prv pt- ptc ptd pte pto ptp ptr ptt ptv pvc pvd pve pvo pvp pvr pvt pvv rcc rcd rce rco rcp rcr rct rcv rdc rdd rde rdo rdp rdr rdt rdv re- rec red ree reo rep rer ret rev roc rod roe roo rop ror rot rov rpc rpd rpe rpo rpp rpr rpt rpv rrc rrd rrp rrr rrt rtc rtd rte rto rtp rtr rtt rtv rvc rvd rve rvo rvp rvr rvt rvv tcc tcd tce tco tcp tcr tct tcv tdc tdd tde tdo tdp tdr tdt tdv te- tec ted tee teo tep ter tet tev to- toc tod toe too top tor tot tov tpc tpd tpe tpo tpp tpr tpt tpv trc trd tre tro trp trr trt trv ttc ttd tte tto ttp ttr ttt ttv tvc tvd tve tvo tvp tvr tvt v-e vcc vcd vce vco vcp vcr vct vdc vdd vde vdo vdp vdr vdt vdv vec ved vee veo vep ver vet voc vod voe voo vop vor vot vov vpc vpd vpe vpo vpp vpr vpt vrc vrd vre vrp vrr vrt vtc vte vto vtr vtt vtv vvc vvo vvr vvt vvv