-er c-- ccc cce ccm ccp ccr ccs ce- cec cee cem cep cer ces cmc cme cmm cmp cmr cms cpc cpe cpm cpp cpr cps crc cre crm crp crr crs csc cse csm csp csr css ec- ecc ece ecm ecr ecs eec eee eem eep eer ees em- emc eme emm emp emr ems ep- epc epe epm epp epr eps erc ere erm erp err ers es- esc ese esm esp esr ess m-r mc- mcc mce mcm mcp mcr mcs mec mee mem mep mer mes mmc mme mmm mmp mmr mms mpc mpe mpm mpp mpr mps mrc mre mrm mrp mrr mrs msc mse msm msp msr mss p-p pcc pce pcm pcp pcr pcs pec pee pem pep per pes pmc pme pmm pmp pmr pms ppc ppe ppm ppp ppr pps prc pre prm prp prr prs ps- psc pse psm psp psr pss rcc rce rcm rcp rcr rcs re- rec ree rem rep rer res rmc rme rmm rmp rmr rms rpc rpe rpm rpp rpr rps rrc rrm rrp rrr rrs rsc rse rsm rsp rsr rss scc sce scm scp scr scs se- sec see sem sep ser ses smc sme smm smp smr sms spc spe spm spp spr sps sr- src sre srm srp srr srs ss- ssc sse ssm ssp ssr sss