-er a-a a-c aaa aac aad aae aag aan aao aar ac- aca acc acd ace acg acn aco acr ad- ada adc add ade adg adn ado adr aea aec aed aee aeg aen aeo aer ag- aga agc agd age agg agn ago agr an- ana anc and ane ang ann ano anr aoa aoc aod aoe aog aon aoo aor ar- ara arc ard are arg arn aro arr c-- caa cac cad cae cag can cao car cca ccc ccd cce ccg ccn cco ccr cda cdc cdd cde cdg cdn cdo cdr ce- cea cec ced cee ceg cen ceo cer cga cgc cgd cge cgg cgn cgo cgr cn- cna cnc cnd cne cng cnn cno cnr co- coa coc cod coe cog con coo cor cra crc crd cre crg crn cro crr daa dac dad dae dag dan dao dar dca dcc dcd dce dcg dcn dco dcr dda ddc ddd dde ddg ddn ddo ddr de- dea dec ded dee deg den deo der dga dgc dgd dge dgg dgn dgr dna dnc dnd dne dng dnn dno dnr doa doc dod doe dog don doo dor dra drc drd dre drg drn dro drr eaa eac ead eae eag ean eao ear ec- eca ecc ecd ece ecg ecn eco ecr ed- eda edc edd ede edg edn edo edr eea eec eed eee eeg een eeo eer ega egc egd ege egg egn ego egr en- ena enc end ene eng enn eno enr eo- eoa eoc eod eoe eog eon eoo eor era erc erd ere erg ern ero err g-d gaa gac gad gae gag gan gao gar gca gcc gcd gce gcg gcn gco gcr gda gdc gdd gde gdn gdo gdr ge- gea gec ged gee geg gen geo ger gga ggc ggd ggg ggn ggo ggr gna gnc gnd gne gnn gno gnr goa goc god goe gog gon goo gor gra grc grd gre grg grn gro grr naa nac nad nae nag nan nao nar nca ncc ncd nce ncg ncn nco ncr nda ndc ndd nde ndg ndn ndo ndr ne- nea nec ned nee neg nen neo ner nga ngc ngd nge ngg ngn ngo nna nnc nne nng nnn nno no- noa noc nod noe nog non noo nor nra nrc nrd nre nrg nrn nro nrr oaa oac oad oae oag oan oao oar oc- oca occ ocd ocg ocn oco ocr oda odc odd ode odg odn odo odr oea oec oed oee oeg oen oeo oer oga ogc ogd oge ogg ogn ogo on- ona onc ond one ong onn ono onr oo- ooa ooc ood oog oon ooo oor or- ora orc ord ore org orn oro orr ra- raa rac rad rae rag ran rao rar rca rcc rcd rce rcg rcn rco rcr rda rdc rdd rde rdg rdn rdo rdr re- rea rec red ree reg ren reo rer rga rgc rgd rge rgg rgn rgo rgr rna rnc rnd rng rnn rno rnr roa roc rod roe rog ron roo ror rra rrc rrd rrg rrn rrr