-er -ey c-- ccc cce ccm cco ccr ccx ce- cec cee cem ceo cer cex cey cmc cme cmm cmo cmr cmx cmy co- coc coe com coo cor cox coy crc cre crm cro crr crx cry cxc cxo cxr cxx cyc cye cym cyo cyr ec- ecc ece ecm eco ecr ecx eec eee eem eeo eer eex eey em- emc eme emm emo emr emx eo- eoc eoe eom eoo eor erc ere erm ero err ery ex- exc exe exo exr exx exy eyc eye eym eyo eyr m-o m-r mc- mcc mce mcm mco mcr mcx mec mee mem meo mer mex mey mmc mme mmm mmo mmr mmx moc moe mom moo mor mox moy mrc mre mrm mro mrr mrx mry mxc mxr my- myc mye mym myo myr myx oc- occ ocm oco ocr ocx oec oee oem oeo oer oex oey om- omc ome omm omo omr omx omy oo- ooc oom ooo oor oox or- orc ore orm oro orr orx ory ox- oxc oxo oxx oxy oye oyo rcc rce rcm rco rcr rcx re- rec ree rem reo rer rex rey rmc rme rmm rmo rmr rmx roc roe rom roo ror rox roy rrc rrm rrr rxr ry- ryc rye rym ryo ryr ryy xcr xcx xee xem xer xex xmc xmm xmo xmr xmx xoc xom xoo xor xox xrc xrx xry xxo xxx xxy xyr xyy ycc yce yco ycy yec yee yem yeo yer yex yey ymc yme ymm ymo yoc yoe yom yoo yor yox yoy yrc yre yro yxe yxy yyc yye yyy