-er eee eef eek een eeo eep eer eet ef- efe eff efo efp efr eft eke ekf eko ekp ekr ekt en- ene enf enk enn eno enp enr ent eo- eoe eof eok eon eoo eop eor eot ep- epe epf epn epo epp epr ept ere erf erk ern ero erp err ert ete etf etk etn eto etp etr ett fee fef fek fen feo fep fer fet ffe fff ffk ffn ffo ffp ffr fft fkf fkk fkp fkt fne fnf fnk fnn fnp fnr fnt foe fof fok fon foo fop for fot fpe fpk fpn fpo fpp fpr fpt fre frf frk frn fro frp frr frt fte ftf ftk ftn fto ftp ftr ftt k-t ke- kee kef kek ken keo kep ker ket kff kfo kke kkk kkn kkp kkr kkt kn- kne knf knk knn kno knp knr knt koe kof kok kon koo kop kor kot kpe kpf kpk kpn kpo kpp kpr kpt krf krk krn kro krp krr krt kte ktf ktk ktn kto ktp ktr ktt ne- nee nef nek nen neo nep ner net nfe nff nfk nfn nfo nfp nfr nft nke nkf nkk nkn nko nkp nkr nkt nne nnf nnk nnn nno nnp nnt no- noe nof nok non noo nop nor not npe npf npn npo npp npr npt nre nrf nrk nrn nro nrp nrr nrt nte ntf ntk ntn nto ntp ntr ntt oee oef oen oeo oep oer oet of- ofe off ofn ofo ofp ofr oft oke okk oko okp okr on- one onf onk onn ono onp onr ont oo- oof ook oon ooo oop oor oot op- ope opf opk opn opo opp opr opt or- ore orf ork orn oro orp orr ort ot- ote otf otk otn oto otp otr ott p-p pee pef pek pen peo pep per pet pfe pff pfk pfn pfo pfp pfr pft pke pkf pkn pko pkp pkr pkt pn- pne pnf pnk pnn pno pnp pnr pnt poe pof pok pon poo pop por pot ppe ppf ppk ppn ppo ppp ppr ppt pre prf prk prn pro prp prr prt pt- pte ptf ptk ptn pto ptp ptr ptt re- ree ref rek ren reo rep rer ret rfe rff rfk rfn rfo rfp rfr rft rke rkf rkk rko rkp rkt rnn rno rnp rnr rnt roe rof rok ron roo rop ror rot rpe rpf rpk rpn rpo rpp rpr rpt rrf rrk rrn rrp rrr rrt rte rtf rtk rtn rto rtp rtr rtt te- tee tef tek ten teo tep ter tet tfe tff tfk tfn tfo tfp tfr tft tke tkk tko tkp tkr tkt tne tnf tnk tnn tno tnp tnr tnt to- toe tof tok ton too top tor tot tpe tpf tpk tpn tpo tpp tpr tpt tre trf trk trn tro trp trr trt tte ttf ttk ttn tto ttp ttr ttt