-er eee eem een eep eer ees em- eme emm emn emp emr ems en- ene enm enn enp enr ens ep- epe epm epn epp epr eps ere erm ern erp err ers es- ese esm esn esp esr ess m-r mee mem men mep mer mes mme mmm mmn mmp mmr mms mne mnm mnn mnp mnr mns mpe mpm mpn mpp mpr mps mre mrm mrn mrp mrr mrs mse msm msn msp msr mss ne- nee nem nen nep ner nes nme nmm nmn nmp nmr nms nne nnm nnn nnp nns npe npm npn npp npr nps nre nrm nrn nrp nrr nrs nse nsm nsn nsp nsr nss p-p pee pem pen pep per pes pme pmm pmn pmp pmr pms pn- pne pnm pnn pnp pnr pns ppe ppm ppn ppp ppr pps pre prm prn prp prr prs ps- pse psm psn psp psr pss re- ree rem ren rep rer res rme rmm rmn rmp rmr rms rnm rnn rnp rnr rns rpe rpm rpn rpp rpr rps rrm rrn rrp rrr rrs rse rsm rsn rsp rsr rss se- see sem sen sep ser ses sme smm smn smp smr sms sne snm snn snp snr sns spe spm spn spp spr sps sr- sre srm srn srp srr srs ss- sse ssm ssn ssp ssr sss