-er eee eek een eeo eep eer eet eke eko ekp ekr ekt en- ene enk enn eno enp enr ent eo- eoe eok eon eoo eop eor eot ep- epe epn epo epp epr ept ere erk ern ero erp err ert ete etk etn eto etp etr ett k-t ke- kee kek ken keo kep ker ket kke kkk kkn kkp kkr kkt kn- kne knk knn kno knp knr knt koe kok kon koo kop kor kot kpe kpk kpn kpo kpp kpr kpt krk krn kro krp krr krt kte ktk ktn kto ktp ktr ktt ne- nee nek nen neo nep ner net nke nkk nkn nko nkp nkr nkt nne nnk nnn nno nnp nnt no- noe nok non noo nop nor not npe npn npo npp npr npt nre nrk nrn nro nrp nrr nrt nte ntk ntn nto ntp ntr ntt oee oen oeo oep oer oet oke okk oko okp okr on- one onk onn ono onp onr ont oo- ook oon ooo oop oor oot op- ope opk opn opo opp opr opt or- ore ork orn oro orp orr ort ot- ote otk otn oto otp otr ott p-p pee pek pen peo pep per pet pke pkn pko pkp pkr pkt pn- pne pnk pnn pno pnp pnr pnt poe pok pon poo pop por pot ppe ppk ppn ppo ppp ppr ppt pre prk prn pro prp prr prt pt- pte ptk ptn pto ptp ptr ptt re- ree rek ren reo rep rer ret rke rkk rko rkp rkt rnn rno rnp rnr rnt roe rok ron roo rop ror rot rpe rpk rpn rpo rpp rpr rpt rrk rrn rrp rrr rrt rte rtk rtn rto rtp rtr rtt te- tee tek ten teo tep ter tet tke tkk tko tkp tkr tkt tne tnk tnn tno tnp tnr tnt to- toe tok ton too top tor tot tpe tpk tpn tpo tpp tpr tpt tre trk trn tro trp trr trt tte ttk ttn tto ttp ttr ttt