-er -ic a-a a-c a-i aaa aac aad aae aag aai aao aar ac- aca acc acd ace acg aci aco acr ad- ada adc add ade adg adi ado adr aea aec aed aee aeg aei aeo aer ag- aga agc agd age agg agi ago agr ai- aia aic aid aie aig aii aio air aoa aoc aod aoe aog aoi aoo aor ar- ara arc ard are arg ari aro arr c-- caa cac cad cae cag cai cao car cca ccc ccd cce ccg cci cco ccr cda cdc cdd cde cdg cdi cdo cdr ce- cea cec ced cee ceg cei ceo cer cga cgc cgd cge cgg cgi cgo cgr ci- cia cic cid cie cig cii cio cir co- coa coc cod coe cog coi coo cor cra crc crd cre crg cri cro crr daa dac dad dae dag dai dao dar dca dcc dcd dce dcg dci dco dcr dda ddc ddd dde ddg ddi ddo ddr de- dea dec ded dee deg dei deo der dga dgc dgd dge dgg dgi dgr di- dia dic did die dig dii dio dir doa doc dod doe dog doi doo dor dra drc drd dre drg dri dro drr eaa eac ead eae eag eai eao ear ec- eca ecc ecd ece ecg eci eco ecr ed- eda edc edd ede edg edi edo edr eea eec eed eee eeg eeo eer ega egc egd ege egg egi ego egr eia eic eid eie eig eii eio eir eo- eoa eoc eod eoe eog eoi eoo eor era erc erd ere erg eri ero err g-d gaa gac gad gae gag gai gao gar gca gcc gcd gce gcg gci gco gcr gda gdc gdd gde gdi gdo gdr ge- gea gec ged gee geg gei geo ger gga ggc ggd ggg ggi ggo ggr gia gic gid gie gig gii gio gir goa goc god goe gog goi goo gor gra grc grd gre grg gri gro grr i-d ia- iaa iac iad iae iag iai iao iar ica icc icd ice icg ici ico icr ida idc idd ide idg idi ido idr ie- iea iec ied iee ieg iei ier iga igc igd ige igg igi igo igr iia iic iid iie iii iio iir io- ioa ioc iod ioe iog ioi ioo ior ir- ira irc ird ire irg iri iro irr o-i oaa oac oad oae oag oai oao oar oc- oca occ ocd ocg oci oco ocr oda odc odd ode odg odi odo odr oea oec oed oee oeg oei oeo oer oga ogc ogd oge ogg ogi ogo oia oic oid oie oii oio oir oo- ooa ooc ood oog ooi ooo oor or- ora orc ord ore org ori oro orr ra- raa rac rad rae rag rai rao rar rca rcc rcd rce rcg rci rco rcr rda rdc rdd rde rdg rdi rdo rdr re- rea rec red ree reg rei reo rer rga rgc rgd rge rgg rgi rgo rgr ria ric rid rie rig rii rio rir roa roc rod roe rog roi roo ror rra rrc rrd rrg rri rrr