-er c-- ccc cce ccg cck cco ccr ccz ce- cec cee ceg cek ceo cer cez cgc cge cgg cgo cgr ckc cko co- coc coe cog cok coo cor coz crc cre crg crk cro crr crz cz- czc cze czk czo ec- ecc ece ecg eck eco ecr eec eee eeg eek eeo eer egc ege egg ego egr ekc eke ekg eko ekr eo- eoc eoe eog eok eoo eor erc ere erg erk ero err erz eze ezo ezr ezz gcc gce gcg gck gco gcr ge- gec gee geg gek geo ger gez ggc ggg ggo ggr ggz gko goc goe gog gok goo gor goz grc gre grg grk gro grr gzo gzr k-z kcc kce kcg kck kcr ke- kec kee keg kek keo ker kez kgc kgo kkc kke kkk kkr koc koe kog kok koo kor koz krc krg krk kro krr kzo oc- occ ocg ock oco ocr ocz oec oee oeg oeo oer ogc oge ogg ogo okc oke okg okk oko okr oo- ooc oog ook ooo oor or- orc ore org ork oro orr orz oze ozo ozz rcc rce rcg rco rcr re- rec ree reg rek reo rer rez rgc rge rgg rgk rgo rgr rkc rke rkg rkk rko rkz roc roe rog rok roo ror roz rrc rrg rrk rrr rze rzo z-g zce zco zec zee zek zeo zer zez zgg zo- zoc zoe zog zok zoo zor zro zzr zzz