-er -ic c-- ccc cce ccg cci cco ccr ccx ce- cec cee ceg cei ceo cer cex cgc cge cgg cgi cgo cgr ci- cic cie cig cii cio cir cix co- coc coe cog coi coo cor cox crc cre crg cri cro crr crx cxc cxi cxo cxr cxx ec- ecc ece ecg eci eco ecr ecx eec eee eeg eeo eer eex egc ege egg egi ego egr egx eic eie eig eii eio eir eix eo- eoc eoe eog eoi eoo eor erc ere erg eri ero err ex- exc exe exi exo exr exx gcc gce gcg gci gco gcr ge- gec gee geg gei geo ger gex ggc ggg ggi ggo ggr gic gie gig gii gio gir goc goe gog goi goo gor gox grc gre grg gri gro grr grx icc ice icg ici ico icr ie- iec iee ieg iei ier iex igc ige igg igi igo igr iic iie iii iio iir iix io- ioc ioe iog ioi ioo ior ir- irc ire irg iri iro irr irx ixc ixe ixi o-i oc- occ ocg oci oco ocr ocx oec oee oeg oei oeo oer oex ogc oge ogg ogi ogo ogx oic oie oii oio oir oo- ooc oog ooi ooo oor oox or- orc ore org ori oro orr orx ox- oxc oxi oxo oxx rcc rce rcg rci rco rcr rcx re- rec ree reg rei reo rer rex rgc rge rgg rgi rgo rgr rgx ric rie rig rii rio rir rix roc roe rog roi roo ror rox rrc rrg rri rrr rxr xci xcr xcx xee xeg xer xex xge xgi xic xie xii xio xix xoc xog xoi xoo xor xox xrc xrx xxi xxo xxx