-er c-- ccc cce ccm cco ccp ccr cct ce- cec cee cem ceo cep cer cet cmc cme cmm cmo cmp cmr cmt co- coc coe com coo cop cor cot cpc cpe cpm cpo cpp cpr cpt crc cre crm cro crp crr crt ctc cte ctm cto ctp ctr ctt ec- ecc ece ecm eco ecr ect eec eee eem eeo eep eer eet em- emc eme emm emo emp emr emt eo- eoc eoe eom eoo eop eor eot ep- epc epe epm epo epp epr ept erc ere erm ero erp err ert etc ete etm eto etp etr ett m-o m-r mc- mcc mce mcm mco mcp mcr mct mec mee mem meo mep mer met mmc mme mmm mmo mmp mmr mmt moc moe mom moo mop mor mot mpc mpe mpm mpo mpp mpr mpt mrc mre mrm mro mrp mrr mrt mtc mte mtm mto mtp mtr mtt oc- occ ocm oco ocp ocr oct oec oee oem oeo oep oer oet om- omc ome omm omo omp omr omt oo- ooc oom ooo oop oor oot op- opc ope opm opo opp opr opt or- orc ore orm oro orp orr ort ot- otc ote otm oto otp otr ott p-p pcc pce pcm pco pcp pcr pct pec pee pem peo pep per pet pmc pme pmm pmo pmp pmr pmt poc poe pom poo pop por pot ppc ppe ppm ppo ppp ppr ppt prc pre prm pro prp prr prt pt- ptc pte ptm pto ptp ptr ptt rcc rce rcm rco rcp rcr rct re- rec ree rem reo rep rer ret rmc rme rmm rmo rmp rmr rmt roc roe rom roo rop ror rot rpc rpe rpm rpo rpp rpr rpt rrc rrm rrp rrr rrt rtc rte rtm rto rtp rtr rtt tcc tce tcm tco tcp tcr tct te- tec tee tem teo tep ter tet tmc tme tmm tmo tmp tmr tmt to- toc toe tom too top tor tot tpc tpe tpm tpo tpp tpr tpt trc tre trm tro trp trr trt ttc tte ttm tto ttp ttr ttt