-er c-- ccc ccd cce ccm cco ccr ccs cct cdc cdd cde cdm cdo cdr cds cdt ce- cec ced cee cem ceo cer ces cet cmc cmd cme cmm cmo cmr cms cmt co- coc cod coe com coo cor cos cot crc crd cre crm cro crr crs crt csc csd cse csm cso csr css cst ctc ctd cte ctm cto ctr cts ctt dcc dcd dce dcm dco dcr dcs dct ddc ddd dde ddm ddo ddr dds ddt de- dec ded dee dem deo der des det dmc dmd dme dmm dmo dmr dms dmt doc dod doe dom doo dor dos dot drc drd dre drm dro drr drs drt dsc dsd dse dsm dso dsr dss dst dtc dtd dte dtm dto dtr dts dtt ec- ecc ecd ece ecm eco ecr ecs ect ed- edc edd ede edm edo edr eds edt eec eed eee eem eeo eer ees eet em- emc emd eme emm emo emr ems emt eo- eoc eod eoe eom eoo eor eos eot erc erd ere erm ero err ers ert es- esc esd ese esm eso esr ess est etc etd ete etm eto etr ets ett m-o m-r mc- mcc mcd mce mcm mco mcr mcs mct mdc mdd mde mdm mdo mdr mds mdt mec med mee mem meo mer mes met mmc mmd mme mmm mmo mmr mms mmt moc mod moe mom moo mor mos mot mrc mrd mre mrm mro mrr mrs mrt msc msd mse msm mso msr mss mst mtc mtd mte mtm mto mtr mts mtt oc- occ ocd ocm oco ocr ocs oct odc odd ode odm odo odr ods odt oec oed oee oem oeo oer oes oet om- omc omd ome omm omo omr oms omt oo- ooc ood oom ooo oor oos oot or- orc ord ore orm oro orr ors ort os- osc osd ose osm oso osr oss ost ot- otc otd ote otm oto otr ots ott rcc rcd rce rcm rco rcr rcs rct rdc rdd rde rdm rdo rdr rds rdt re- rec red ree rem reo rer res ret rmc rmd rme rmm rmo rmr rms rmt roc rod roe rom roo ror ros rot rrc rrd rrm rrr rrs rrt rsc rsd rse rsm rso rsr rss rst rtc rtd rte rtm rto rtr rts rtt scc scd sce scm sco scr scs sct sdc sdd sde sdm sdo sdr sds sdt se- sec sed see sem seo ser ses set smc smd sme smm smo smr sms smt soc sod soe som soo sor sos sot sr- src srd sre srm sro srr srs srt ss- ssc ssd sse ssm sso ssr sss sst stc std ste stm sto str sts stt tcc tcd tce tcm tco tcr tcs tct tdc tdd tde tdm tdo tdr tds tdt te- tec ted tee tem teo ter tes tet tmc tmd tme tmm tmo tmr tms tmt to- toc tod toe tom too tor tos tot trc trd tre trm tro trr trs trt tsc tsd tse tsm tso tsr tss tst ttc ttd tte ttm tto ttr tts ttt