eee eef eek een eeo eep eet ef- efe eff efo efp eft eke ekf eko ekp ekt en- ene enf enk enn eno enp ent eo- eoe eof eok eon eoo eop eot ep- epe epf epn epo epp ept ete etf etk etn eto etp ett fee fef fek fen feo fep fet ffe fff ffk ffn ffo ffp fft fkf fkk fkp fkt fne fnf fnk fnn fnp fnt foe fof fok fon foo fop fot fpe fpk fpn fpo fpp fpt fte ftf ftk ftn fto ftp ftt k-t ke- kee kef kek ken keo kep ket kff kfo kke kkk kkn kkp kkt kn- kne knf knk knn kno knp knt koe kof kok kon koo kop kot kpe kpf kpk kpn kpo kpp kpt kte ktf ktk ktn kto ktp ktt ne- nee nef nek nen neo nep net nfe nff nfk nfn nfo nfp nft nke nkf nkk nkn nko nkp nkt nne nnf nnk nnn nno nnp nnt no- noe nof nok non noo nop not npe npf npn npo npp npt nte ntf ntk ntn nto ntp ntt oee oef oen oeo oep oet of- ofe off ofn ofo ofp oft oke okk oko okp on- one onf onk onn ono onp ont oo- oof ook oon ooo oop oot op- ope opf opk opn opo opp opt ot- ote otf otk otn oto otp ott p-p pee pef pek pen peo pep pet pfe pff pfk pfn pfo pfp pft pke pkf pkn pko pkp pkt pn- pne pnf pnk pnn pno pnp pnt poe pof pok pon poo pop pot ppe ppf ppk ppn ppo ppp ppt pt- pte ptf ptk ptn pto ptp ptt te- tee tef tek ten teo tep tet tfe tff tfk tfn tfo tfp tft tke tkk tko tkp tkt tne tnf tnk tnn tno tnp tnt to- toe tof tok ton too top tot tpe tpf tpk tpn tpo tpp tpt tte ttf ttk ttn tto ttp ttt