-er -ic a-a a-c a-i aaa aac aae aag aai aao aar ac- aca acc ace acg aci aco acr aea aec aee aeg aei aeo aer ag- aga agc age agg agi ago agr ai- aia aic aie aig aii aio air aoa aoc aoe aog aoi aoo aor ar- ara arc are arg ari aro arr c-- caa cac cae cag cai cao car cca ccc cce ccg cci cco ccr ce- cea cec cee ceg cei ceo cer cga cgc cge cgg cgi cgo cgr ci- cia cic cie cig cii cio cir co- coa coc coe cog coi coo cor cra crc cre crg cri cro crr eaa eac eae eag eai eao ear ec- eca ecc ece ecg eci eco ecr eea eec eee eeg eeo eer ega egc ege egg egi ego egr eia eic eie eig eii eio eir eo- eoa eoc eoe eog eoi eoo eor era erc ere erg eri ero err gaa gac gae gag gai gao gar gca gcc gce gcg gci gco gcr ge- gea gec gee geg gei geo ger gga ggc ggg ggi ggo ggr gia gic gie gig gii gio gir goa goc goe gog goi goo gor gra grc gre grg gri gro grr ia- iaa iac iae iag iai iao iar ica icc ice icg ici ico icr ie- iea iec iee ieg iei ier iga igc ige igg igi igo igr iia iic iie iii iio iir io- ioa ioc ioe iog ioi ioo ior ir- ira irc ire irg iri iro irr o-i oaa oac oae oag oai oao oar oc- oca occ ocg oci oco ocr oea oec oee oeg oei oeo oer oga ogc oge ogg ogi ogo oia oic oie oii oio oir oo- ooa ooc oog ooi ooo oor or- ora orc ore org ori oro orr ra- raa rac rae rag rai rao rar rca rcc rce rcg rci rco rcr re- rea rec ree reg rei reo rer rga rgc rge rgg rgi rgo rgr ria ric rie rig rii rio rir roa roc roe rog roi roo ror rra rrc rrg rri rrr