a-a a-b a-c a-t aaa aab aac aae aag aao aas aat ab- aba abb abc abe abg abo abs abt ac- aca acb acc ace acg aco acs act aea aeb aec aee aeg aeo aes aet ag- aga agb agc age agg ago ags agt aoa aob aoc aoe aog aoo aos aot as- asa asb asc ase asg aso ass ast at- ata atb atc ate atg ato ats att baa bab bac bae bag bao bas bat bba bbb bbc bbe bbg bbo bbs bbt bca bcb bcc bce bcg bco bcs bct be- bea beb bec bee beg beo bes bet bga bgb bgc bge bgg bgo bgs bgt boa bob boc boe bog boo bos bot bsa bsb bsc bse bsg bso bss bst bta btb btc bte btg bto bts btt c-- caa cab cac cae cag cao cas cat cba cbb cbc cbe cbg cbo cbs cbt cca ccb ccc cce ccg cco ccs cct ce- cea ceb cec cee ceg ceo ces cet cga cgb cgc cge cgg cgo cgs cgt co- coa cob coc coe cog coo cos cot csa csb csc cse csg cso css cst cta ctb ctc cte ctg cto cts ctt eaa eab eac eae eag eao eas eat eba ebb ebc ebe ebg ebo ebs ebt ec- eca ecb ecc ece ecg eco ecs ect eea eeb eec eee eeg eeo ees eet ega egb egc ege egg ego egs egt eo- eoa eob eoc eoe eog eoo eos eot es- esa esb esc ese esg eso ess est eta etb etc ete etg eto ets ett gaa gab gac gae gag gao gas gat gba gbc gbe gbg gbo gbs gbt gca gcb gcc gce gcg gco gcs gct ge- gea geb gec gee geg geo ges get gga ggb ggc ggg ggo ggs ggt goa gob goc goe gog goo gos got gsa gsb gsc gse gsg gso gss gst gta gtb gtc gte gtg gto gts gtt oaa oab oac oae oag oao oas oat ob- oba obb obc obe obg obo obs obt oc- oca ocb occ ocg oco ocs oct oea oeb oec oee oeg oeo oes oet oga ogc oge ogg ogo ogs ogt oo- ooa oob ooc oog ooo oos oot os- osa osb osc ose osg oso oss ost ot- ota otb otc ote otg oto ots ott saa sab sac sae sag sao sas sat sba sbb sbc sbe sbg sbo sbs sbt sca scb scc sce scg sco scs sct se- sea seb sec see seg seo ses set sga sgb sgc sge sgg sgo sgs sgt soa sob soc soe sog soo sos sot ss- ssa ssb ssc sse ssg sso sss sst sta stb stc ste stg sto sts stt taa tab tac tae tag tao tas tat tba tbb tbc tbe tbg tbo tbs tbt tca tcb tcc tce tcg tco tcs tct te- tea teb tec tee teg teo tes tet tga tgb tgc tge tgg tgo tgs tgt to- toa tob toc toe tog too tos tot tsa tsb tsc tse tsg tso tss tst tta ttb ttc tte ttg tto tts ttt