-er -ey c-- ccc cce ccg ccn cco ccr ccx ce- cec cee ceg cen ceo cer cex cey cgc cge cgg cgn cgo cgr cgy cn- cnc cne cng cnn cno cnr cnx cny co- coc coe cog con coo cor cox coy crc cre crg crn cro crr crx cry cxc cxo cxr cxx cyc cye cyg cyn cyo cyr ec- ecc ece ecg ecn eco ecr ecx eec eee eeg een eeo eer eex eey egc ege egg egn ego egr egx egy en- enc ene eng enn eno enr eny eo- eoc eoe eog eon eoo eor erc ere erg ern ero err ery ex- exc exe exo exr exx exy eyc eye eyn eyo eyr gcc gce gcg gcn gco gcr ge- gec gee geg gen geo ger gex gey ggc ggg ggn ggo ggr gnc gne gnn gno gnr goc goe gog gon goo gor gox goy grc gre grg grn gro grr grx gry gy- gye gyn gyo gyr ncc nce ncg ncn nco ncr ncx ne- nec nee neg nen neo ner nex ney ngc nge ngg ngn ngo nnc nne nng nnn nno no- noc noe nog non noo nor nox noy nrc nre nrg nrn nro nrr nrx nry nxc nyc nye nyg nyn nyo nyx nyy oc- occ ocg ocn oco ocr ocx oec oee oeg oen oeo oer oex oey ogc oge ogg ogn ogo ogx ogy on- onc one ong onn ono onr onx ony oo- ooc oog oon ooo oor oox or- orc ore org orn oro orr orx ory ox- oxc oxn oxo oxx oxy oye oyo rcc rce rcg rcn rco rcr rcx re- rec ree reg ren reo rer rex rey rgc rge rgg rgn rgo rgr rgx rnc rng rnn rno rnr rny roc roe rog ron roo ror rox roy rrc rrg rrn rrr rxr ry- ryc rye ryg ryn ryo ryr ryy xcr xcx xee xeg xen xer xex xge xnc xno xoc xog xon xoo xor xox xrc xrx xry xxo xxx xxy xyr xyy ycc yce yco ycy yec yee yeg yen yeo yer yex yey ygc ygo yne yng ynn yny yoc yoe yog yon yoo yor yox yoy yrc yre yrg yrn yro yxe yxy yyc yye yyg yyy