-er -ey eee eek een eeo eer eex eey eke eko ekr eky en- ene enk enn eno enr eny eo- eoe eok eon eoo eor ere erk ern ero err ery ex- exe exo exr exx exy eye eyn eyo eyr ke- kee kek ken keo ker kex key kke kkk kkn kkr kky kn- kne knk knn kno knr knx koe kok kon koo kor koy krk krn kro krr kry kxo kxy kye kyn kyo kyr kyx ne- nee nek nen neo ner nex ney nke nkk nkn nko nkr nky nne nnk nnn nno no- noe nok non noo nor nox noy nre nrk nrn nro nrr nrx nry nye nyk nyn nyo nyx nyy oee oen oeo oer oex oey oke okk oko okr on- one onk onn ono onr onx ony oo- ook oon ooo oor oox or- ore ork orn oro orr orx ory ox- oxn oxo oxx oxy oye oyo re- ree rek ren reo rer rex rey rke rkk rko rky rnn rno rnr rny roe rok ron roo ror rox roy rrk rrn rrr rxr ry- rye ryk ryn ryo ryr ryy xee xen xer xex xke xnk xno xok xon xoo xor xox xrx xry xxo xxx xxy xyr xyy yee yek yen yeo yer yex yey ykk ykn yne ynk ynn yny yoe yok yon yoo yor yox yoy yre yrn yro yxe yxy yye yyy