-er -ic a-a a-c a-i aaa aac aae aag aai aao aar aas ac- aca acc ace acg aci aco acr acs aea aec aee aeg aei aeo aer aes ag- aga agc age agg agi ago agr ags ai- aia aic aie aig aii aio air ais aoa aoc aoe aog aoi aoo aor aos ar- ara arc are arg ari aro arr ars as- asa asc ase asg asi aso asr ass c-- caa cac cae cag cai cao car cas cca ccc cce ccg cci cco ccr ccs ce- cea cec cee ceg cei ceo cer ces cga cgc cge cgg cgi cgo cgr cgs ci- cia cic cie cig cii cio cir cis co- coa coc coe cog coi coo cor cos cra crc cre crg cri cro crr crs csa csc cse csg csi cso csr css eaa eac eae eag eai eao ear eas ec- eca ecc ece ecg eci eco ecr ecs eea eec eee eeg eeo eer ees ega egc ege egg egi ego egr egs eia eic eie eig eii eio eir eis eo- eoa eoc eoe eog eoi eoo eor eos era erc ere erg eri ero err ers es- esa esc ese esg esi eso esr ess gaa gac gae gag gai gao gar gas gca gcc gce gcg gci gco gcr gcs ge- gea gec gee geg gei geo ger ges gga ggc ggg ggi ggo ggr ggs gia gic gie gig gii gio gir gis goa goc goe gog goi goo gor gos gra grc gre grg gri gro grr grs gsa gsc gse gsg gsi gso gsr gss ia- iaa iac iae iag iai iao iar ias ica icc ice icg ici ico icr ics ie- iea iec iee ieg iei ier ies iga igc ige igg igi igo igr igs iia iic iie iii iio iir iis io- ioa ioc ioe iog ioi ioo ior ios ir- ira irc ire irg iri iro irr irs is- isa isc ise isg isi iso isr iss o-i oaa oac oae oag oai oao oar oas oc- oca occ ocg oci oco ocr ocs oea oec oee oeg oei oeo oer oes oga ogc oge ogg ogi ogo ogs oia oic oie oii oio oir ois oo- ooa ooc oog ooi ooo oor oos or- ora orc ore org ori oro orr ors os- osa osc ose osg osi oso osr oss ra- raa rac rae rag rai rao rar ras rca rcc rce rcg rci rco rcr rcs re- rea rec ree reg rei reo rer res rga rgc rge rgg rgi rgo rgr rgs ria ric rie rig rii rio rir ris roa roc roe rog roi roo ror ros rra rrc rrg rri rrr rrs rsa rsc rse rsg rsi rso rsr rss saa sac sae sag sai sao sar sas sca scc sce scg sci sco scr scs se- sea sec see seg sei seo ser ses sga sgc sge sgg sgi sgo sgr sgs sia sic sie sig sii sio sir sis soa soc soe sog soi soo sor sos sr- sra src sre srg sri sro srr srs ss- ssa ssc sse ssg ssi sso ssr sss