-er -ey c-- ccc cce cco ccr ccx ce- cec cee ceo cer cex cey co- coc coe coo cor cox coy crc cre cro crr crx cry cxc cxo cxr cxx cyc cye cyo cyr ec- ecc ece eco ecr ecx eec eee eeo eer eex eey eo- eoc eoe eoo eor erc ere ero err ery ex- exc exe exo exr exx exy eyc eye eyo eyr oc- occ oco ocr ocx oec oee oeo oer oex oey oo- ooc ooo oor oox or- orc ore oro orr orx ory ox- oxc oxo oxx oxy oye oyo rcc rce rco rcr rcx re- rec ree reo rer rex rey roc roe roo ror rox roy rrc rrr rxr ry- ryc rye ryo ryr ryy xcr xcx xee xer xex xoc xoo xor xox xrc xrx xry xxo xxx xxy xyr xyy ycc yce yco ycy yec yee yeo yer yex yey yoc yoe yoo yor yox yoy yrc yre yro yxe yxy yyc yye yyy