-er a-a a-c aaa aac aad aae aaf aag aan aar ac- aca acc acd ace acf acg acn acr ad- ada adc add ade adf adg adn adr aea aec aed aee aef aeg aen aer af- afa afc afd afe aff afg afn afr ag- aga agc agd age agf agg agn agr an- ana anc and ane anf ang ann anr ar- ara arc ard are arf arg arn arr c-- caa cac cad cae caf cag can car cca ccc ccd cce ccf ccg ccn ccr cda cdc cdd cde cdf cdg cdn cdr ce- cea cec ced cee cef ceg cen cer cfa cfc cfd cfe cff cfg cfn cfr cga cgc cgd cge cgg cgn cgr cn- cna cnc cnd cne cnf cng cnn cnr cra crc crd cre crf crg crn crr daa dac dad dae daf dag dan dar dca dcc dcd dce dcf dcg dcn dcr dda ddc ddd dde ddf ddg ddn ddr de- dea dec ded dee def deg den der dfa dfc dfd dfe dff dfg dfn dfr dga dgc dgd dge dgf dgg dgn dgr dna dnc dnd dne dnf dng dnn dnr dra drc drd dre drg drn drr eaa eac ead eae eaf eag ean ear ec- eca ecc ecd ece ecf ecg ecn ecr ed- eda edc edd ede edf edg edn edr eea eec eed eee eef eeg een eer ef- efa efc efd efe eff efg efr ega egc egd ege egf egg egn egr en- ena enc end ene enf eng enn enr era erc erd ere erf erg ern err faa fac fad fae faf fag fan far fca fcc fcd fce fcf fcg fcn fcr fda fdc fdd fde fdf fdg fdn fdr fea fec fed fee fef feg fen fer ffa ffc ffd ffe fff ffg ffn ffr fga fgc fgd fge fgf fgg fgn fgr fna fnc fnd fne fnf fng fnn fnr fra frc frd fre frf frg frn frr g-d gaa gac gad gae gaf gag gan gar gca gcc gcd gce gcf gcg gcn gcr gda gdc gdd gde gdf gdn gdr ge- gea gec ged gee gef geg gen ger gfa gfc gfd gfe gff gfr gga ggc ggd ggg ggn ggr gna gnc gnd gne gnf gnn gnr gra grc grd gre grf grg grn grr naa nac nad nae naf nag nan nar nca ncc ncd nce ncf ncg ncn ncr nda ndc ndd nde ndf ndg ndn ndr ne- nea nec ned nee nef neg nen ner nfa nfc nfd nfe nff nfn nfr nga ngc ngd nge ngf ngg ngn nna nnc nne nnf nng nnn nra nrc nrd nre nrf nrg nrn nrr ra- raa rac rad rae raf rag ran rar rca rcc rcd rce rcf rcg rcn rcr rda rdc rdd rde rdf rdg rdn rdr re- rea rec red ree ref reg ren rer rfa rfc rfd rfe rff rfg rfn rfr rga rgc rgd rge rgf rgg rgn rgr rna rnc rnd rng rnn rnr rra rrc rrd rrf rrg rrn rrr