a-a a-b a-t aaa aab aae aag aao aas aat ab- aba abb abe abg abo abs abt aea aeb aee aeg aeo aes aet ag- aga agb age agg ago ags agt aoa aob aoe aog aoo aos aot as- asa asb ase asg aso ass ast at- ata atb ate atg ato ats att baa bab bae bag bao bas bat bba bbb bbe bbg bbo bbs bbt be- bea beb bee beg beo bes bet bga bgb bge bgg bgo bgs bgt boa bob boe bog boo bos bot bsa bsb bse bsg bso bss bst bta btb bte btg bto bts btt eaa eab eae eag eao eas eat eba ebb ebe ebg ebo ebs ebt eea eeb eee eeg eeo ees eet ega egb ege egg ego egs egt eo- eoa eob eoe eog eoo eos eot es- esa esb ese esg eso ess est eta etb ete etg eto ets ett gaa gab gae gag gao gas gat gba gbe gbg gbo gbs gbt ge- gea geb gee geg geo ges get gga ggb ggg ggo ggs ggt goa gob goe gog goo gos got gsa gsb gse gsg gso gss gst gta gtb gte gtg gto gts gtt oaa oab oae oag oao oas oat ob- oba obb obe obg obo obs obt oea oeb oee oeg oeo oes oet oga oge ogg ogo ogs ogt oo- ooa oob oog ooo oos oot os- osa osb ose osg oso oss ost ot- ota otb ote otg oto ots ott saa sab sae sag sao sas sat sba sbb sbe sbg sbo sbs sbt se- sea seb see seg seo ses set sga sgb sge sgg sgo sgs sgt soa sob soe sog soo sos sot ss- ssa ssb sse ssg sso sss sst sta stb ste stg sto sts stt taa tab tae tag tao tas tat tba tbb tbe tbg tbo tbs tbt te- tea teb tee teg teo tes tet tga tgb tge tgg tgo tgs tgt to- toa tob toe tog too tos tot tsa tsb tse tsg tso tss tst tta ttb tte ttg tto tts ttt