-er -ic c-- ccc cce ccg cci cck cco ccr ce- cec cee ceg cei cek ceo cer cgc cge cgg cgi cgo cgr ci- cic cie cig cii cik cio cir ckc cki cko co- coc coe cog coi cok coo cor crc cre crg cri crk cro crr ec- ecc ece ecg eci eck eco ecr eec eee eeg eek eeo eer egc ege egg egi ego egr eic eie eig eii eik eio eir ekc eke ekg eki eko ekr eo- eoc eoe eog eoi eok eoo eor erc ere erg eri erk ero err gcc gce gcg gci gck gco gcr ge- gec gee geg gei gek geo ger ggc ggg ggi ggo ggr gic gie gig gii gik gio gir gko goc goe gog goi gok goo gor grc gre grg gri grk gro grr icc ice icg ici ick ico icr ie- iec iee ieg iei iek ier igc ige igg igi igk igo igr iic iie iii iio iir ikc ike iki ikk iko ikr io- ioc ioe iog ioi ioo ior ir- irc ire irg iri irk iro irr kcc kce kcg kci kck kcr ke- kec kee keg kei kek keo ker kgc kgi kgo kic kie kig kii kik kio kir kkc kke kki kkk kkr koc koe kog koi kok koo kor krc krg kri krk kro krr o-i oc- occ ocg oci ock oco ocr oec oee oeg oei oeo oer ogc oge ogg ogi ogo oic oie oii oik oio oir okc oke okg oki okk oko okr oo- ooc oog ooi ook ooo oor or- orc ore org ori ork oro orr rcc rce rcg rci rco rcr re- rec ree reg rei rek reo rer rgc rge rgg rgi rgk rgo rgr ric rie rig rii rik rio rir rkc rke rkg rkk rko roc roe rog roi rok roo ror rrc rrg rri rrk rrr