-er -ey eee eeo eer ees eex eey eo- eoe eoo eor eos ere ero err ers ery es- ese eso esr ess esx esy ex- exe exo exr exs exx exy eye eyo eyr eys oee oeo oer oes oex oey oo- ooo oor oos oox or- ore oro orr ors orx ory os- ose oso osr oss osx ox- oxo oxx oxy oye oyo oys re- ree reo rer res rex rey roe roo ror ros rox roy rrr rrs rse rso rsr rss rsx rxr rxs ry- rye ryo ryr rys ryy se- see seo ser ses sex sey soe soo sor sos sox soy sr- sre sro srr srs srx sry ss- sse sso ssr sss ssx sxs sy- sye syr sys syx xee xer xes xex xoo xor xos xox xrx xry xss xxo xxx xxy xyr xyy yee yeo yer yes yex yey yoe yoo yor yos yox yoy yre yro yrs yse yso ysr yss ysy yxe yxy yye yys yyy