-er c-- ccc ccd cce ccf ccm cco ccr cct cdc cdd cde cdf cdm cdo cdr cdt ce- cec ced cee cef cem ceo cer cet cfc cfd cfe cff cfm cfo cfr cft cmc cmd cme cmf cmm cmo cmr cmt co- coc cod coe cof com coo cor cot crc crd cre crf crm cro crr crt ctc ctd cte ctf ctm cto ctr ctt dcc dcd dce dcf dcm dco dcr dct ddc ddd dde ddf ddm ddo ddr ddt de- dec ded dee def dem deo der det dfc dfd dfe dff dfm dfo dfr dft dmc dmd dme dmf dmm dmo dmr dmt doc dod doe dof dom doo dor dot drc drd dre drm dro drr drt dtc dtd dte dtf dtm dto dtr dtt ec- ecc ecd ece ecf ecm eco ecr ect ed- edc edd ede edf edm edo edr edt eec eed eee eef eem eeo eer eet ef- efc efd efe eff efm efo efr eft em- emc emd eme emf emm emo emr emt eo- eoc eod eoe eof eom eoo eor eot erc erd ere erf erm ero err ert etc etd ete etf etm eto etr ett fcc fcd fce fcf fcm fco fcr fct fdc fdd fde fdf fdm fdo fdr fdt fec fed fee fef fem feo fer fet ffc ffd ffe fff ffm ffo ffr fft fmc fmd fme fmf fmm fmo fmr fmt foc foe fof fom foo for fot frc frd fre frf frm fro frr frt ftc ftd fte ftf ftm fto ftr ftt m-f m-o m-r mc- mcc mcd mce mcf mcm mco mcr mct mdc mdd mde mdf mdm mdo mdr mdt mec med mee mef mem meo mer met mfc mfd mfe mff mfm mfo mfr mft mmc mmd mme mmf mmm mmo mmr mmt moc mod moe mof mom moo mor mot mrc mrd mre mrf mrm mro mrr mrt mtc mtd mte mtf mtm mto mtr mtt oc- occ ocd ocf ocm oco ocr oct odc odd ode odf odm odo odr odt oec oed oee oef oem oeo oer oet of- ofc ofd ofe off ofm ofo ofr oft om- omc omd ome omf omm omo omr omt oo- ooc ood oof oom ooo oor oot or- orc ord ore orf orm oro orr ort ot- otc otd ote otf otm oto otr ott rcc rcd rce rcf rcm rco rcr rct rdc rdd rde rdf rdm rdo rdr rdt re- rec red ree ref rem reo rer ret rfc rfd rfe rff rfm rfo rfr rft rmc rmd rme rmf rmm rmo rmr rmt roc rod roe rof rom roo ror rot rrc rrd rrf rrm rrr rrt rtc rtd rte rtf rtm rto rtr rtt tcc tcd tce tcf tcm tco tcr tct tdc tdd tde tdf tdm tdo tdr tdt te- tec ted tee tef tem teo ter tet tfc tfd tfe tff tfm tfo tfr tft tmc tmd tme tmf tmm tmo tmr tmt to- toc tod toe tof tom too tor tot trc trd tre trf trm tro trr trt ttc ttd tte ttf ttm tto ttr ttt