-er a-a a-c aaa aac aad aae aag aan aar ac- aca acc acd ace acg acn acr ad- ada adc add ade adg adn adr aea aec aed aee aeg aen aer ag- aga agc agd age agg agn agr an- ana anc and ane ang ann anr ar- ara arc ard are arg arn arr c-- caa cac cad cae cag can car cca ccc ccd cce ccg ccn ccr cda cdc cdd cde cdg cdn cdr ce- cea cec ced cee ceg cen cer cga cgc cgd cge cgg cgn cgr cn- cna cnc cnd cne cng cnn cnr cra crc crd cre crg crn crr daa dac dad dae dag dan dar dca dcc dcd dce dcg dcn dcr dda ddc ddd dde ddg ddn ddr de- dea dec ded dee deg den der dga dgc dgd dge dgg dgn dgr dna dnc dnd dne dng dnn dnr dra drc drd dre drg drn drr eaa eac ead eae eag ean ear ec- eca ecc ecd ece ecg ecn ecr ed- eda edc edd ede edg edn edr eea eec eed eee eeg een eer ega egc egd ege egg egn egr en- ena enc end ene eng enn enr era erc erd ere erg ern err g-d gaa gac gad gae gag gan gar gca gcc gcd gce gcg gcn gcr gda gdc gdd gde gdn gdr ge- gea gec ged gee geg gen ger gga ggc ggd ggg ggn ggr gna gnc gnd gne gnn gnr gra grc grd gre grg grn grr naa nac nad nae nag nan nar nca ncc ncd nce ncg ncn ncr nda ndc ndd nde ndg ndn ndr ne- nea nec ned nee neg nen ner nga ngc ngd nge ngg ngn nna nnc nne nng nnn nra nrc nrd nre nrg nrn nrr ra- raa rac rad rae rag ran rar rca rcc rcd rce rcg rcn rcr rda rdc rdd rde rdg rdn rdr re- rea rec red ree reg ren rer rga rgc rgd rge rgg rgn rgr rna rnc rnd rng rnn rnr rra rrc rrd rrg rrn rrr