-er a-a a-c aaa aac aad aae aaf aag aao aar ac- aca acc acd ace acf acg aco acr ad- ada adc add ade adf adg ado adr aea aec aed aee aef aeg aeo aer af- afa afc afd afe aff afg afo afr ag- aga agc agd age agf agg ago agr aoa aoc aod aoe aof aog aoo aor ar- ara arc ard are arf arg aro arr c-- caa cac cad cae caf cag cao car cca ccc ccd cce ccf ccg cco ccr cda cdc cdd cde cdf cdg cdo cdr ce- cea cec ced cee cef ceg ceo cer cfa cfc cfd cfe cff cfg cfo cfr cga cgc cgd cge cgg cgo cgr co- coa coc cod coe cof cog coo cor cra crc crd cre crf crg cro crr daa dac dad dae daf dag dao dar dca dcc dcd dce dcf dcg dco dcr dda ddc ddd dde ddf ddg ddo ddr de- dea dec ded dee def deg deo der dfa dfc dfd dfe dff dfg dfo dfr dga dgc dgd dge dgf dgg dgr doa doc dod doe dof dog doo dor dra drc drd dre drg dro drr eaa eac ead eae eaf eag eao ear ec- eca ecc ecd ece ecf ecg eco ecr ed- eda edc edd ede edf edg edo edr eea eec eed eee eef eeg eeo eer ef- efa efc efd efe eff efg efo efr ega egc egd ege egf egg ego egr eo- eoa eoc eod eoe eof eog eoo eor era erc erd ere erf erg ero err faa fac fad fae faf fag fao far fca fcc fcd fce fcf fcg fco fcr fda fdc fdd fde fdf fdg fdo fdr fea fec fed fee fef feg feo fer ffa ffc ffd ffe fff ffg ffo ffr fga fgc fgd fge fgf fgg fgr foa foc foe fof fog foo for fra frc frd fre frf frg fro frr g-d gaa gac gad gae gaf gag gao gar gca gcc gcd gce gcf gcg gco gcr gda gdc gdd gde gdf gdo gdr ge- gea gec ged gee gef geg geo ger gfa gfc gfd gfe gff gfo gfr gga ggc ggd ggg ggo ggr goa goc god goe gof gog goo gor gra grc grd gre grf grg gro grr oaa oac oad oae oaf oag oao oar oc- oca occ ocd ocf ocg oco ocr oda odc odd ode odf odg odo odr oea oec oed oee oef oeg oeo oer of- ofa ofc ofd ofe off ofg ofo ofr oga ogc ogd oge ogf ogg ogo oo- ooa ooc ood oof oog ooo oor or- ora orc ord ore orf org oro orr ra- raa rac rad rae raf rag rao rar rca rcc rcd rce rcf rcg rco rcr rda rdc rdd rde rdf rdg rdo rdr re- rea rec red ree ref reg reo rer rfa rfc rfd rfe rff rfg rfo rfr rga rgc rgd rge rgf rgg rgo rgr roa roc rod roe rof rog roo ror rra rrc rrd rrf rrg rrr