-er c-- ccc cce ccm ccr ccs cct ce- cec cee cem cer ces cet cmc cme cmm cmr cms cmt crc cre crm crr crs crt csc cse csm csr css cst ctc cte ctm ctr cts ctt ec- ecc ece ecm ecr ecs ect eec eee eem eer ees eet em- emc eme emm emr ems emt erc ere erm err ers ert es- esc ese esm esr ess est etc ete etm etr ets ett m-r mc- mcc mce mcm mcr mcs mct mec mee mem mer mes met mmc mme mmm mmr mms mmt mrc mre mrm mrr mrs mrt msc mse msm msr mss mst mtc mte mtm mtr mts mtt rcc rce rcm rcr rcs rct re- rec ree rem rer res ret rmc rme rmm rmr rms rmt rrc rrm rrr rrs rrt rsc rse rsm rsr rss rst rtc rte rtm rtr rts rtt scc sce scm scr scs sct se- sec see sem ser ses set smc sme smm smr sms smt sr- src sre srm srr srs srt ss- ssc sse ssm ssr sss sst stc ste stm str sts stt tcc tce tcm tcr tcs tct te- tec tee tem ter tes tet tmc tme tmm tmr tms tmt trc tre trm trr trs trt tsc tse tsm tsr tss tst ttc tte ttm ttr tts ttt