-er eee eem eep eer ees em- eme emm emp emr ems ep- epe epm epp epr eps ere erm erp err ers es- ese esm esp esr ess m-r mee mem mep mer mes mme mmm mmp mmr mms mpe mpm mpp mpr mps mre mrm mrp mrr mrs mse msm msp msr mss p-p pee pem pep per pes pme pmm pmp pmr pms ppe ppm ppp ppr pps pre prm prp prr prs ps- pse psm psp psr pss re- ree rem rep rer res rme rmm rmp rmr rms rpe rpm rpp rpr rps rrm rrp rrr rrs rse rsm rsp rsr rss se- see sem sep ser ses sme smm smp smr sms spe spm spp spr sps sr- sre srm srp srr srs ss- sse ssm ssp ssr sss