-er c-- ccc ccd cce ccf cco ccr cct cdc cdd cde cdf cdo cdr cdt ce- cec ced cee cef ceo cer cet cfc cfd cfe cff cfo cfr cft co- coc cod coe cof coo cor cot crc crd cre crf cro crr crt ctc ctd cte ctf cto ctr ctt dcc dcd dce dcf dco dcr dct ddc ddd dde ddf ddo ddr ddt de- dec ded dee def deo der det dfc dfd dfe dff dfo dfr dft doc dod doe dof doo dor dot drc drd dre dro drr drt dtc dtd dte dtf dto dtr dtt ec- ecc ecd ece ecf eco ecr ect ed- edc edd ede edf edo edr edt eec eed eee eef eeo eer eet ef- efc efd efe eff efo efr eft eo- eoc eod eoe eof eoo eor eot erc erd ere erf ero err ert etc etd ete etf eto etr ett fcc fcd fce fcf fco fcr fct fdc fdd fde fdf fdo fdr fdt fec fed fee fef feo fer fet ffc ffd ffe fff ffo ffr fft foc foe fof foo for fot frc frd fre frf fro frr frt ftc ftd fte ftf fto ftr ftt oc- occ ocd ocf oco ocr oct odc odd ode odf odo odr odt oec oed oee oef oeo oer oet of- ofc ofd ofe off ofo ofr oft oo- ooc ood oof ooo oor oot or- orc ord ore orf oro orr ort ot- otc otd ote otf oto otr ott rcc rcd rce rcf rco rcr rct rdc rdd rde rdf rdo rdr rdt re- rec red ree ref reo rer ret rfc rfd rfe rff rfo rfr rft roc rod roe rof roo ror rot rrc rrd rrf rrr rrt rtc rtd rte rtf rto rtr rtt tcc tcd tce tcf tco tcr tct tdc tdd tde tdf tdo tdr tdt te- tec ted tee tef teo ter tet tfc tfd tfe tff tfo tfr tft to- toc tod toe tof too tor tot trc trd tre trf tro trr trt ttc ttd tte ttf tto ttr ttt