-er eee eef eek een eeo eep eer ef- efe eff efi efo efp efr eie eif eii eik ein eio eip eir eke ekf eki eko ekp ekr en- ene enf eni enk enn eno enp enr eo- eoe eof eoi eok eon eoo eop eor ep- epe epf epi epn epo epp epr ere erf eri erk ern ero erp err fee fef fei fek fen feo fep fer ffe fff ffi ffk ffn ffo ffp ffr fie fif fii fik fin fip fir fkf fki fkk fkp fne fnf fni fnk fnn fnp fnr foe fof foi fok fon foo fop for fpe fpi fpk fpn fpo fpp fpr fre frf fri frk frn fro frp frr i-f ie- iee ief iei iek ien iep ier ife iff ifi ifn ifo ifp ifr iie iif iii iin iio iip iir ike ikf iki ikk iko ikr in- ine inf ini ink inn ino inp inr io- ioe iof ioi ion ioo iop ior ipe ipf ipi ipn ipo ipp ipr ir- ire irf iri irk irn iro irp irr ke- kee kef kei kek ken keo kep ker kff kfi kfo kie kif kii kik kin kio kip kir kke kki kkk kkn kkp kkr kn- kne knf kni knk knn kno knp knr koe kof koi kok kon koo kop kor kpe kpf kpi kpk kpn kpo kpp kpr krf kri krk krn kro krp krr n-i ne- nee nef nei nek nen neo nep ner nfe nff nfi nfk nfn nfo nfp nfr nie nif nii nik nin nio nip nir nke nkf nki nkk nkn nko nkp nkr nne nnf nni nnk nnn nno nnp no- noe nof noi nok non noo nop nor npe npf npi npn npo npp npr nre nrf nri nrk nrn nro nrp nrr o-i oee oef oei oen oeo oep oer of- ofe off ofi ofn ofo ofp ofr oie oif oii oik oin oio oip oir oke oki okk oko okp okr on- one onf oni onk onn ono onp onr oo- oof ooi ook oon ooo oop oor op- ope opf opi opk opn opo opp opr or- ore orf ori ork orn oro orp orr p-p pee pef pei pek pen peo pep per pfe pff pfi pfk pfn pfo pfp pfr pie pif pii pik pin pio pip pir pke pkf pki pkn pko pkp pkr pn- pne pnf pni pnk pnn pno pnp pnr poe pof poi pok pon poo pop por ppe ppf ppi ppk ppn ppo ppp ppr pre prf pri prk prn pro prp prr re- ree ref rei rek ren reo rep rer rfe rff rfi rfk rfn rfo rfp rfr rie rif rii rik rin rio rip rir rke rkf rkk rko rkp rni rnn rno rnp rnr roe rof roi rok ron roo rop ror rpe rpf rpi rpk rpn rpo rpp rpr rrf rri rrk rrn rrp rrr