-er -ic c-- ccc ccd cce ccg cci cco ccr cdc cdd cde cdg cdi cdo cdr ce- cec ced cee ceg cei ceo cer cgc cgd cge cgg cgi cgo cgr ci- cic cid cie cig cii cio cir co- coc cod coe cog coi coo cor crc crd cre crg cri cro crr dcc dcd dce dcg dci dco dcr ddc ddd dde ddg ddi ddo ddr de- dec ded dee deg dei deo der dgc dgd dge dgg dgi dgr di- dic did die dig dii dio dir doc dod doe dog doi doo dor drc drd dre drg dri dro drr ec- ecc ecd ece ecg eci eco ecr ed- edc edd ede edg edi edo edr eec eed eee eeg eeo eer egc egd ege egg egi ego egr eic eid eie eig eii eio eir eo- eoc eod eoe eog eoi eoo eor erc erd ere erg eri ero err g-d gcc gcd gce gcg gci gco gcr gdc gdd gde gdi gdo gdr ge- gec ged gee geg gei geo ger ggc ggd ggg ggi ggo ggr gic gid gie gig gii gio gir goc god goe gog goi goo gor grc grd gre grg gri gro grr i-d icc icd ice icg ici ico icr idc idd ide idg idi ido idr ie- iec ied iee ieg iei ier igc igd ige igg igi igo igr iic iid iie iii iio iir io- ioc iod ioe iog ioi ioo ior ir- irc ird ire irg iri iro irr o-i oc- occ ocd ocg oci 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 oio oir oo- ooc ood oog ooi ooo oor or- orc ord ore org ori oro orr rcc rcd rce rcg rci rco rcr rdc rdd rde rdg rdi rdo rdr re- rec red ree reg rei reo rer rgc rgd rge rgg rgi rgo rgr ric rid rie rig rii rio rir roc rod roe rog roi roo ror rrc rrd rrg rri rrr