-er -ic c-- ccc ccd cce ccg cci cck cco ccr cdc cdd cde cdg cdi cdk cdo cdr ce- cec ced cee ceg cei cek ceo cer cgc cgd cge cgg cgi cgo cgr ci- cic cid cie cig cii cik cio cir ckc ckd cki cko co- coc cod coe cog coi cok coo cor crc crd cre crg cri crk cro crr dcc dcd dce dcg dci dck dco dcr ddc ddd dde ddg ddi ddk ddo ddr de- dec ded dee deg dei dek deo der dgc dgd dge dgg dgi dgk dgr di- dic did die dig dii dik dio dir dkc dke dkg dki dkk dko dkr doc dod doe dog doi dok doo dor drc drd dre drg dri drk dro drr ec- ecc ecd ece ecg eci eck eco ecr ed- edc edd ede edg edi edk edo edr eec eed eee eeg eek eeo eer egc egd ege egg egi ego egr eic eid eie eig eii eik eio eir ekc ekd eke ekg eki eko ekr eo- eoc eod eoe eog eoi eok eoo eor erc erd ere erg eri erk ero err g-d gcc gcd gce gcg gci gck gco gcr gdc gdd gde gdi gdk gdo gdr ge- gec ged gee geg gei gek geo ger ggc ggd ggg ggi ggo ggr gic gid gie gig gii gik gio gir gkd gko goc god goe gog goi gok goo gor grc grd gre grg gri grk gro grr i-d icc icd ice icg ici ick ico icr idc idd ide idg idi idk ido idr ie- iec ied iee ieg iei iek ier igc igd ige igg igi igk igo igr iic iid iie iii iio iir ikc ike iki ikk iko ikr io- ioc iod ioe iog ioi ioo ior ir- irc ird ire irg iri irk iro irr kcc kcd kce kcg kci kck kcr kdc kde kdg kdk kdo kdr ke- kec ked kee keg kei kek keo ker kgc kgd kgi kgo kic kid kie kig kii kik kio kir kkc kke kki kkk kkr koc kod koe kog koi kok koo kor krc krd krg kri krk kro krr o-i oc- occ ocd ocg oci ock oco ocr odc odd ode odg odi odo odr oec oed oee oeg oei oeo oer ogc ogd oge ogg ogi ogo oic oid oie oii oik oio oir okc okd oke okg oki okk oko okr oo- ooc ood oog ooi ook ooo oor or- orc ord ore org ori ork oro orr rcc rcd rce rcg rci rco rcr rdc rdd rde rdg rdi rdo rdr re- rec red ree reg rei rek reo rer rgc rgd rge rgg rgi rgk rgo rgr ric rid rie rig rii rik rio rir rkc rke rkg rkk rko roc rod roe rog roi rok roo ror rrc rrd rrg rri rrk rrr