-er c-- ccc ccd cce cco ccr cct ccv cdc cdd cde cdo cdr cdt cdv ce- cec ced cee ceo cer cet cev co- coc cod coe coo cor cot cov crc crd cre cro crr crt crv ctc ctd cte cto ctr ctt ctv cvc cvd cve cvo cvr cvt cvv dcc dcd dce dco dcr dct dcv ddc ddd dde ddo ddr ddt de- dec ded dee deo der det dev doc dod doe doo dor dot dov drc drd dre dro drr drt drv dtc dtd dte dto dtr dtt dtv dvc dvd dve dvr dvt ec- ecc ecd ece eco ecr ect ecv ed- edc edd ede edo edr edt eec eed eee eeo eer eet eev eo- eoc eod eoe eoo eor eot erc erd ere ero err ert erv etc etd ete eto etr ett etv evc evd eve evo evr evt evv oc- occ ocd oco ocr oct ocv odc odd ode odo odr odt odv oec oed oee oeo oer oet oo- ooc ood ooo oor oot oov or- orc ord ore oro orr ort orv ot- otc otd ote oto otr ott otv ov- ovc ovd ove ovo ovv rcc rcd rce rco rcr rct rcv rdc rdd rde rdo rdr rdt rdv re- rec red ree reo rer ret rev roc rod roe roo ror rot rov rrc rrd rrr rrt rtc rtd rte rto rtr rtt rtv rvc rvd rve rvo rvr rvt rvv tcc tcd tce tco tcr tct tcv tdc tdd tde tdo tdr tdt tdv te- tec ted tee teo ter tet tev to- toc tod toe too tor tot tov trc trd tre tro trr trt trv ttc ttd tte tto ttr ttt ttv tvc tvd tve tvo tvr tvt v-e vcc vcd vce vco vcr vct vdc vdd vde vdo vdr vdt vdv vec ved vee veo ver vet voc vod voe voo vor vot vov vrc vrd vre vrr vrt vtc vte vto vtr vtt vtv vvc vvo vvr vvt vvv