-er eee eef eem een eeo eep eer ef- efe eff efm efo efp efr em- eme emf emm emn emo emp emr en- ene enf enm enn eno enp enr eo- eoe eof eom eon eoo eop eor ep- epe epf epm epn epo epp epr ere erf erm ern ero erp err fee fef fem fen feo fep fer ffe fff ffm ffn ffo ffp ffr fme fmf fmm fmn fmo fmp fmr fne fnf fnm fnn fnp fnr foe fof fom fon foo fop for fpe fpm fpn fpo fpp fpr fre frf frm frn fro frp frr m-f m-o m-r mee mef mem men meo mep mer mfe mff mfm mfn mfo mfp mfr mme mmf mmm mmn mmo mmp mmr mne mnf mnm mnn mno mnp mnr moe mof mom mon moo mop mor mpe mpf mpm mpn mpo mpp mpr mre mrf mrm mrn mro mrp mrr ne- nee nef nem nen neo nep ner nfe nff nfn nfo nfp nfr nme nmm nmn nmo nmp nmr nne nnf nnm nnn nno nnp no- noe nof nom non noo nop nor npe npf npm npn npo npp npr nre nrf nrm nrn nro nrp nrr oee oef oem oen oeo oep oer of- ofe off ofm ofn ofo ofp ofr om- ome omf omm omn omo omp omr on- one onf onn ono onp onr oo- oof oom oon ooo oop oor op- ope opf opm opn opo opp opr or- ore orf orm orn oro orp orr p-p pee pef pem pen peo pep per pfe pff pfm pfn pfo pfp pfr pme pmf pmm pmn pmo pmp pmr pn- pne pnf pnm pnn pno pnp pnr poe pof pom pon poo pop por ppe ppf ppm ppn ppo ppp ppr pre prf prm prn pro prp prr re- ree ref rem ren reo rep rer rfe rff rfm rfn rfo rfp rfr rme rmf rmm rmn rmo rmp rmr rnm rnn rno rnp rnr roe rof rom ron roo rop ror rpe rpf rpm rpn rpo rpp rpr rrf rrm rrn rrp rrr