-er c-- ccc cce ccm cco ccr ccs cct ce- cec cee cem ceo cer ces cet cmc cme cmm cmo cmr cms cmt co- coc coe com coo cor cos cot crc cre crm cro crr crs crt csc cse csm cso csr css cst ctc cte ctm cto ctr cts ctt ec- ecc ece ecm eco ecr ecs ect eec eee eem eeo eer ees eet em- emc eme emm emo emr ems emt eo- eoc eoe eom eoo eor eos eot erc ere erm ero err ers ert es- esc ese esm eso esr ess est etc ete etm eto etr ets ett m-o m-r mc- mcc mce mcm mco mcr mcs mct mec mee mem meo mer mes met mmc mme mmm mmo mmr mms mmt moc moe mom moo mor mos mot mrc mre mrm mro mrr mrs mrt msc mse msm mso msr mss mst mtc mte mtm mto mtr mts mtt oc- occ ocm oco ocr ocs oct oec oee oem oeo oer oes oet om- omc ome omm omo omr oms omt oo- ooc oom ooo oor oos oot or- orc ore orm oro orr ors ort os- osc ose osm oso osr oss ost ot- otc ote otm oto otr ots ott rcc rce rcm rco rcr rcs rct re- rec ree rem reo rer res ret rmc rme rmm rmo rmr rms rmt roc roe rom roo ror ros rot rrc rrm rrr rrs rrt rsc rse rsm rso rsr rss rst rtc rte rtm rto rtr rts rtt scc sce scm sco scr scs sct se- sec see sem seo ser ses set smc sme smm smo smr sms smt soc soe som soo sor sos sot sr- src sre srm sro srr srs srt ss- ssc sse ssm sso ssr sss sst stc ste stm sto str sts stt tcc tce tcm tco tcr tcs tct te- tec tee tem teo ter tes tet tmc tme tmm tmo tmr tms tmt to- toc toe tom too tor tos tot trc tre trm tro trr trs trt tsc tse tsm tso tsr tss tst ttc tte ttm tto ttr tts ttt