-er eee eek eem een eeo eep eer eke eko ekp ekr em- eme emk emm emn emo emp emr en- ene enk enm enn eno enp enr eo- eoe eok eom eon eoo eop eor ep- epe epm epn epo epp epr ere erk erm ern ero erp err ke- kee kek kem ken keo kep ker kke kkk kkm kkn kkp kkr kme kmk kmm kmo kmp kn- kne knk knm knn kno knp knr koe kok kom kon koo kop kor kpe kpk kpm kpn kpo kpp kpr krk krn kro krp krr m-o m-r mee mek mem men meo mep mer mke mkk mkm mkn mko mkp mkr mme mmk mmm mmn mmo mmp mmr mne mnk mnm mnn mno mnp mnr moe mok mom mon moo mop mor mpe mpk mpm mpn mpo mpp mpr mre mrk mrm mrn mro mrp mrr ne- nee nek nem nen neo nep ner nke nkk nkm nkn nko nkp nkr nme nmk nmm nmn nmo nmp nmr nne nnk nnm nnn nno nnp no- noe nok nom non noo nop nor npe npm npn npo npp npr nre nrk nrm nrn nro nrp nrr oee oem oen oeo oep oer oke okk oko okp okr om- ome omm omn omo omp omr on- one onk onn ono onp onr oo- ook oom oon ooo oop oor op- ope opk opm opn opo opp opr or- ore ork orm orn oro orp orr p-p pee pek pem pen peo pep per pke pkm pkn pko pkp pkr pme pmk pmm pmn pmo pmp pmr pn- pne pnk pnm pnn pno pnp pnr poe pok pom pon poo pop por ppe ppk ppm ppn ppo ppp ppr pre prk prm prn pro prp prr re- ree rek rem ren reo rep rer rke rkk rkm rko rkp rme rmm rmn rmo rmp rmr rnm rnn rno rnp rnr roe rok rom ron roo rop ror rpe rpk rpm rpn rpo rpp rpr rrk rrm rrn rrp rrr