a-a a-b a-t aaa aab aae aag aao aas aat aav ab- aba abb abe abg abo abs abt abv aea aeb aee aeg aeo aes aet aev ag- aga agb age agg ago ags agt agv aoa aob aoe aog aoo aos aot aov as- asa asb ase asg aso ass ast asv at- ata atb ate atg ato ats att atv av- ava avb ave avg avo avs avt baa bab bae bag bao bas bat bav bba bbb bbe bbg bbo bbs bbt be- bea beb bee beg beo bes bet bev bga bgb bge bgg bgo bgs bgt bgv boa bob boe bog boo bos bot bov bsa bsb bse bsg bso bss bst bsv bta btb bte btg bto bts btt btv bva bvb bve bvg bvo bvs bvt bvv eaa eab eae eag eao eas eat eav eba ebb ebe ebg ebo ebs ebt ebv eea eeb eee eeg eeo ees eet eev ega egb ege egg ego egs egt eo- eoa eob eoe eog eoo eos eot es- esa esb ese esg eso ess est esv eta etb ete etg eto ets ett etv eva evb eve evg evo evs evt evv gaa gab gae gag gao gas gat gav gba gbe gbg gbo gbs gbt gbv ge- gea geb gee geg geo ges get gev gga ggb ggg ggo ggs ggt ggv goa gob goe gog goo gos got gov gsa gsb gse gsg gso gss gst gsv gta gtb gte gtg gto gts gtt gtv gva gvb gve gvg gvo gvs gvt oaa oab oae oag oao oas oat oav ob- oba obb obe obg obo obs obt obv oea oeb oee oeg oeo oes oet oga oge ogg ogo ogs ogt oo- ooa oob oog ooo oos oot oov os- osa osb ose osg oso oss ost osv ot- ota otb ote otg oto ots ott otv ov- ova ovb ove ovo ovs ovv saa sab sae sag sao sas sat sav sba sbb sbe sbg sbo sbs sbt sbv se- sea seb see seg seo ses set sev sga sgb sge sgg sgo sgs sgt sgv soa sob soe sog soo sos sot sov ss- ssa ssb sse ssg sso sss sst ssv sta stb ste stg sto sts stt stv sva svb sve svg svo svs svt svv taa tab tae tag tao tas tat tav tba tbb tbe tbg tbo tbs tbt tbv te- tea teb tee teg teo tes tet tev tga tgb tge tgg tgo tgs tgt tgv to- toa tob toe tog too tos tot tov tsa tsb tse tsg tso tss tst tsv tta ttb tte ttg tto tts ttt ttv tva tvb tve tvg tvo tvs tvt v-a v-e vaa vab vae vag vao vas vat vav vba vbg vbo vbs vbv vea veb vee veg veo ves vet vga vgg vgo vgs vgt voa vob voe vog voo vos vot vov vsa vsb vse vsg vso vss vst vsv vta vtb vte vtg vto vts vtt vtv vva vvb vvg vvo vvs vvt vvv