-er -ey c-- ccc cce cco ccr ccs ccx ce- cec cee ceo cer ces cex cey co- coc coe coo cor cos cox coy crc cre cro crr crs crx cry csc cse cso csr css csx csy cxc cxo cxr cxs cxx cyc cye cyo cyr cys ec- ecc ece eco ecr ecs ecx eec eee eeo eer ees eex eey eo- eoc eoe eoo eor eos erc ere ero err ers ery es- esc ese eso esr ess esx esy ex- exc exe exo exr exs exx exy eyc eye eyo eyr eys oc- occ oco ocr ocs ocx oec oee oeo oer oes oex oey oo- ooc ooo oor oos oox or- orc ore oro orr ors orx ory os- osc ose oso osr oss osx ox- oxc oxo oxx oxy oye oyo oys rcc rce rco rcr rcs rcx re- rec ree reo rer res rex rey roc roe roo ror ros rox roy rrc rrr rrs rsc rse rso rsr rss rsx rxr rxs ry- ryc rye ryo ryr rys ryy scc sce sco scr scs scx se- sec see seo ser ses sex sey soc soe soo sor sos sox soy sr- src sre sro srr srs srx sry ss- ssc sse sso ssr sss ssx sxc sxs sy- syc sye syr sys syx xcr xcx xee xer xes xex xoc xoo xor xos xox xrc xrx xry xsc xss xxo xxx xxy xyr xyy ycc yce yco ycs ycy yec yee yeo yer yes yex yey yoc yoe yoo yor yos yox yoy yrc yre yro yrs ysc yse yso ysr yss ysy yxe yxy yyc yye yys yyy