-er c-- ccc ccd cce ccm cco ccr cct cdc cdd cde cdm cdo cdr cdt ce- cec ced cee cem ceo cer cet cmc cmd cme cmm cmo cmr cmt co- coc cod coe com coo cor cot crc crd cre crm cro crr crt ctc ctd cte ctm cto ctr ctt dcc dcd dce dcm dco dcr dct ddc ddd dde ddm ddo ddr ddt de- dec ded dee dem deo der det dmc dmd dme dmm dmo dmr dmt doc dod doe dom doo dor dot drc drd dre drm dro drr drt dtc dtd dte dtm dto dtr dtt ec- ecc ecd ece ecm eco ecr ect ed- edc edd ede edm edo edr edt eec eed eee eem eeo eer eet em- emc emd eme emm emo emr emt eo- eoc eod eoe eom eoo eor eot erc erd ere erm ero err ert etc etd ete etm eto etr ett m-o m-r mc- mcc mcd mce mcm mco mcr mct mdc mdd mde mdm mdo mdr mdt mec med mee mem meo mer met mmc mmd mme mmm mmo mmr mmt moc mod moe mom moo mor mot mrc mrd mre mrm mro mrr mrt mtc mtd mte mtm mto mtr mtt oc- occ ocd ocm oco ocr oct odc odd ode odm odo odr odt oec oed oee oem oeo oer oet om- omc omd ome omm omo omr omt oo- ooc ood oom ooo oor oot or- orc ord ore orm oro orr ort ot- otc otd ote otm oto otr ott rcc rcd rce rcm rco rcr rct rdc rdd rde rdm rdo rdr rdt re- rec red ree rem reo rer ret rmc rmd rme rmm rmo rmr rmt roc rod roe rom roo ror rot rrc rrd rrm rrr rrt rtc rtd rte rtm rto rtr rtt tcc tcd tce tcm tco tcr tct tdc tdd tde tdm tdo tdr tdt te- tec ted tee tem teo ter tet tmc tmd tme tmm tmo tmr tmt to- toc tod toe tom too tor tot trc trd tre trm tro trr trt ttc ttd tte ttm tto ttr ttt