a-a a-b aaa aab aae aag aao aas aau aav ab- aba abb abe abg abo abs abu abv aea aeb aee aeg aeo aes aeu aev ag- aga agb age agg ago ags agu agv aoa aob aoe aog aoo aos aou aov as- asa asb ase asg aso ass asu asv au- aua aub aue aug auo aus auv av- ava avb ave avg avo avs avu b-u baa bab bae bag bao bas bau bav bba bbb bbe bbg bbo bbs bbu be- bea beb bee beg beo bes beu bev bga bgb bge bgg bgo bgs bgu bgv boa bob boe bog boo bos bou bov bsa bsb bse bsg bso bss bsu bsv bua bub bue bug buo bus buu bva bvb bve bvg bvo bvs bvu bvv eaa eab eae eag eao eas eau eav eba ebb ebe ebg ebo ebs ebu ebv eea eeb eee eeg eeo ees eev ega egb ege egg ego egs egu eo- eoa eob eoe eog eoo eos eou es- esa esb ese esg eso ess esu esv eu- eua eub eue eug eus euv eva evb eve evg evo evs evv gaa gab gae gag gao gas gau gav gba gbe gbg gbo gbs gbu gbv ge- gea geb gee geg geo ges geu gev gga ggb ggg ggo ggs ggu ggv goa gob goe gog goo gos gou gov gsa gsb gse gsg gso gss gsu gsv gu- gua gub gue gug guo gus guu guv gva gvb gve gvg gvo gvs gvu oaa oab oae oag oao oas oau oav ob- oba obb obe obg obo obs obu obv oea oeb oee oeg oeo oes oga oge ogg ogo ogs oo- ooa oob oog ooo oos oov os- osa osb ose osg oso oss osu osv ou- oua oue ouo ous ov- ova ovb ove ovo ovs ovv saa sab sae sag sao sas sau sav sba sbb sbe sbg sbo sbs sbu sbv se- sea seb see seg seo ses seu sev sga sgb sge sgg sgo sgs sgu sgv soa sob soe sog soo sos sou sov ss- ssa ssb sse ssg sso sss ssu ssv sua sub sue sug suo sus suu suv sva svb sve svg svo svs svu svv ua- uaa uab uae uag uao uas uau uav uba ubb ube ubg ubo ubs ubu ubv uea ueb uee ueg ues uga ugb uge ugg ugo ugs ugu uoa uob uoe uog uoo uos usa usb use usg uso uss usu usv uua uue uug uus uuu uva uvb uve uvo uvs uvu uvv v-a v-e vaa vab vae vag vao vas vau vav vba vbg vbo vbs vbv vea veb vee veg veo ves veu vga vgg vgo vgs vgu voa vob voe vog voo vos vou vov vsa vsb vse vsg vso vss vsu vsv vue vug vus vuv vva vvb vvg vvo vvs vvv