-er -ic c-- ccc cce ccg cci cck cco ccr cct ce- cec cee ceg cei cek ceo cer cet cgc cge cgg cgi cgo cgr cgt ci- cic cie cig cii cik cio cir cit ckc cki cko ckt co- coc coe cog coi cok coo cor cot crc cre crg cri crk cro crr crt ctc cte ctg cti ctk cto ctr ctt ec- ecc ece ecg eci eck eco ecr ect eec eee eeg eek eeo eer eet egc ege egg egi ego egr egt eic eie eig eii eik eio eir eit ekc eke ekg eki eko ekr ekt eo- eoc eoe eog eoi eok eoo eor eot erc ere erg eri erk ero err ert etc ete etg eti etk eto etr ett gcc gce gcg gci gck gco gcr gct ge- gec gee geg gei gek geo ger get ggc ggg ggi ggo ggr ggt gic gie gig gii gik gio gir git gko gkt goc goe gog goi gok goo gor got grc gre grg gri grk gro grr grt gtc gte gtg gti gtk gto gtr gtt icc ice icg ici ick ico icr ict ie- iec iee ieg iei iek ier iet igc ige igg igi igk igo igr igt iic iie iii iio iir iit ikc ike iki ikk iko ikr ikt io- ioc ioe iog ioi ioo ior iot ir- irc ire irg iri irk iro irr irt itc ite itg iti itk ito itt k-t kcc kce kcg kci kck kcr kct ke- kec kee keg kei kek keo ker ket kgc kgi kgo kic kie kig kii kik kio kir kit kkc kke kki kkk kkr kkt koc koe kog koi kok koo kor kot krc krg kri krk kro krr krt ktc kte ktg ktk kto ktr ktt o-i oc- occ ocg oci ock oco ocr oct oec oee oeg oei oeo oer oet ogc oge ogg ogi ogo ogt oic oie oii oik oio oir oit okc oke okg oki okk oko okr oo- ooc oog ooi ook ooo oor oot or- orc ore org ori ork oro orr ort ot- otc ote otg oti otk oto otr ott rcc rce rcg rci rco rcr rct re- rec ree reg rei rek reo rer ret rgc rge rgg rgi rgk rgo rgr rgt ric rie rig rii rik rio rir rit rkc rke rkg rkk rko rkt roc roe rog roi rok roo ror rot rrc rrg rri rrk rrr rrt rtc rte rtg rti rtk rto rtr rtt tcc tce tcg tci tck tco tcr tct te- tec tee teg tei tek teo ter tet tgc tge tgg tgi tgk tgo tgr tgt tic tie tig tii tik tio tir tit tkc tke tkg tkk tko tkr tkt to- toc toe tog toi tok too tor tot trc tre trg tri trk tro trr trt ttc tte ttg tti ttk tto ttr ttt