-er -ey eee een eeo eep eer eex eey en- ene enn eno enp enr eny eo- eoe eon eoo eop eor ep- epe epn epo epp epr epx ere ern ero erp err ery ex- exe exo exp exr exx exy eye eyn eyo eyp eyr ne- nee nen neo nep ner nex ney nne nnn nno nnp no- noe non noo nop nor nox noy npe npn npo npp npr nre nrn nro nrp nrr nrx nry nye nyn nyo nyp nyx nyy oee oen oeo oep oer oex oey on- one onn ono onp onr onx ony oo- oon ooo oop oor oox op- ope opn opo opp opr opx opy or- ore orn oro orp orr orx ory ox- oxn oxo oxx oxy oye oyo p-p pee pen peo pep per pex pey pn- pne pnn pno pnp pnr pnx pny poe pon poo pop por pox poy ppe ppn ppo ppp ppr ppx pre prn pro prp prr prx pry pxe pxr py- pye pyn pyo pyr pyx re- ree ren reo rep rer rex rey rnn rno rnp rnr rny roe ron roo rop ror rox roy rpe rpn rpo rpp rpr rpx rrn rrp rrr rxp rxr ry- rye ryn ryo ryr ryy xee xen xep xer xex xno xon xoo xop xor xox xpe xpn xpo xpp xrx xry xxo xxp xxx xxy xyp xyr xyy yee yen yeo yep yer yex yey yne ynn ynp yny yoe yon yoo yop yor yox yoy ypo yre yrn yro yrp yxe yxy yye yyy