-er c-- ccc cce ccg cco ccr ccz ce- cec cee ceg ceo cer cez cgc cge cgg cgo cgr co- coc coe cog coo cor coz crc cre crg cro crr crz cz- czc cze czo ec- ecc ece ecg eco ecr eec eee eeg eeo eer egc ege egg ego egr eo- eoc eoe eog eoo eor erc ere erg ero err erz eze ezo ezr ezz gcc gce gcg gco gcr ge- gec gee geg geo ger gez ggc ggg ggo ggr ggz goc goe gog goo gor goz grc gre grg gro grr gzo gzr oc- occ ocg oco ocr ocz oec oee oeg oeo oer ogc oge ogg ogo oo- ooc oog ooo oor or- orc ore org oro orr orz oze ozo ozz rcc rce rcg rco rcr re- rec ree reg reo rer rez rgc rge rgg rgo rgr roc roe rog roo ror roz rrc rrg rrr rze rzo z-g zce zco zec zee zeo zer zez zgg zo- zoc zoe zog zoo zor zro zzr zzz