-er a-a a-c a-t aaa aac aad aae aaf aag aao aar aat ac- aca acc acd ace acf acg aco acr act ad- ada adc add ade adf adg ado adr adt aea aec aed aee aef aeg aeo aer aet af- afa afc afd afe aff afg afo afr aft ag- aga agc agd age agf agg ago agr agt aoa aoc aod aoe aof aog aoo aor aot ar- ara arc ard are arf arg aro arr art at- ata atc atd ate atf atg ato atr att c-- caa cac cad cae caf cag cao car cat cca ccc ccd cce ccf ccg cco ccr cct cda cdc cdd cde cdf cdg cdo cdr cdt ce- cea cec ced cee cef ceg ceo cer cet cfa cfc cfd cfe cff cfg cfo cfr cft cga cgc cgd cge cgg cgo cgr cgt co- coa coc cod coe cof cog coo cor cot cra crc crd cre crf crg cro crr crt cta ctc ctd cte ctf ctg cto ctr ctt daa dac dad dae daf dag dao dar dat dca dcc dcd dce dcf dcg dco dcr dct dda ddc ddd dde ddf ddg ddo ddr ddt de- dea dec ded dee def deg deo der det dfa dfc dfd dfe dff dfg dfo dfr dft dga dgc dgd dge dgf dgg dgr dgt doa doc dod doe dof dog doo dor dot dra drc drd dre drg dro drr drt dta dtc dtd dte dtf dtg dto dtr dtt eaa eac ead eae eaf eag eao ear eat ec- eca ecc ecd ece ecf ecg eco ecr ect ed- eda edc edd ede edf edg edo edr edt eea eec eed eee eef eeg eeo eer eet ef- efa efc efd efe eff efg efo efr eft ega egc egd ege egf egg ego egr egt eo- eoa eoc eod eoe eof eog eoo eor eot era erc erd ere erf erg ero err ert eta etc etd ete etf etg eto etr ett faa fac fad fae faf fag fao far fat fca fcc fcd fce fcf fcg fco fcr fct fda fdc fdd fde fdf fdg fdo fdr fdt fea fec fed fee fef feg feo fer fet ffa ffc ffd ffe fff ffg ffo ffr fft fga fgc fgd fge fgf fgg fgr fgt foa foc foe fof fog foo for fot fra frc frd fre frf frg fro frr frt fta ftc ftd fte ftf ftg fto ftr ftt g-d gaa gac gad gae gaf gag gao gar gat gca gcc gcd gce gcf gcg gco gcr gct gda gdc gdd gde gdf gdo gdr gdt ge- gea gec ged gee gef geg geo ger get gfa gfc gfd gfe gff gfo gfr gft gga ggc ggd ggg ggo ggr ggt goa goc god goe gof gog goo gor got gra grc grd gre grf grg gro grr grt gta gtc gtd gte gtf gtg gto gtr gtt oaa oac oad oae oaf oag oao oar oat oc- oca occ ocd ocf ocg oco ocr oct oda odc odd ode odf odg odo odr odt oea oec oed oee oef oeg oeo oer oet of- ofa ofc ofd ofe off ofg ofo ofr oft oga ogc ogd oge ogf ogg ogo ogt oo- ooa ooc ood oof oog ooo oor oot or- ora orc ord ore orf org oro orr ort ot- ota otc otd ote otf otg oto otr ott ra- raa rac rad rae raf rag rao rar rat rca rcc rcd rce rcf rcg rco rcr rct rda rdc rdd rde rdf rdg rdo rdr rdt re- rea rec red ree ref reg reo rer ret rfa rfc rfd rfe rff rfg rfo rfr rft rga rgc rgd rge rgf rgg rgo rgr rgt roa roc rod roe rof rog roo ror rot rra rrc rrd rrf rrg rrr rrt rta rtc rtd rte rtf rtg rto rtr rtt taa tac tad tae taf tag tao tar tat tca tcc tcd tce tcf tcg tco tcr tct tda tdc tdd tde tdf tdg tdo tdr tdt te- tea tec ted tee tef teg teo ter tet tfa tfc tfd tfe tff tfg tfo tfr tft tga tgc tge tgf tgg tgo tgr tgt to- toa toc tod toe tof tog too tor tot tra trc trd tre trf trg tro trr trt tta ttc ttd tte ttf ttg tto ttr ttt