a-a a-b a-t aaa aab aag aao aar aas aat aau ab- aba abb abg abo abr abs abt abu ag- aga agb agg ago agr ags agt agu aoa aob aog aoo aor aos aot aou ar- ara arb arg aro arr ars art aru as- asa asb asg aso asr ass ast asu at- ata atb atg ato atr ats att atu au- aua aub aug auo aur aus aut b-u baa bab bag bao bar bas bat bau bba bbb bbg bbo bbr bbs bbt bbu bga bgb bgg bgo bgr bgs bgt bgu boa bob bog boo bor bos bot bou bra brb brg bro brr brs brt bru bsa bsb bsg bso bsr bss bst bsu bta btb btg bto btr bts btt btu bua bub bug buo bur bus but buu gaa gab gag gao gar gas gat gau gba gbg gbo gbr gbs gbt gbu gga ggb ggg ggo ggr ggs ggt ggu goa gob gog goo gor gos got gou gra grb grg gro grr grs grt gru gsa gsb gsg gso gsr gss gst gsu gta gtb gtg gto gtr gts gtt gtu gu- gua gub gug guo gur gus gut guu oaa oab oag oao oar oas oat oau ob- oba obb obg obo obr obs obt obu oga ogg ogo ogs ogt oo- ooa oob oog ooo oor oos oot or- ora orb org oro orr ors ort oru os- osa osb osg oso osr oss ost osu ot- ota otb otg oto otr ots ott otu ou- oua ouo our ous out ra- raa rab rag rao rar ras rat rau rba rbb rbg rbo rbr rbs rbt rbu rga rgb rgg rgo rgr rgs rgt roa rob rog roo ror ros rot rou rra rrb rrg rrr rrs rrt rru rsa rsb rsg rso rsr rss rst rsu rta rtb rtg rto rtr rts rtt rtu rua rub rug ruo rur rus rut ruu saa sab sag sao sar sas sat sau sba sbb sbg sbo sbr sbs sbt sbu sga sgb sgg sgo sgr sgs sgt sgu soa sob sog soo sor sos sot sou sr- sra srb srg sro srr srs srt ss- ssa ssb ssg sso ssr sss sst ssu sta stb stg sto str sts stt stu sua sub sug suo sur sus sut suu taa tab tag tao tar tas tat tau tba tbb tbg tbo tbr tbs tbt tbu tga tgb tgg tgo tgr tgs tgt tgu to- toa tob tog too tor tos tot tou tra trb trg tro trr trs trt tru tsa tsb tsg tso tsr tss tst tsu tta ttb ttg tto ttr tts ttt ttu tua tub tug tuo tur tus tut tuu ua- uaa uab uag uao uar uas uat uau uba ubb ubg ubo ubr ubs ubt ubu uga ugb ugg ugo ugr ugs ugt ugu uoa uob uog uoo uor uos uot ur- ura urb urg uro urr urs urt uru usa usb usg uso usr uss ust usu uta utb uto utr uts utt utu uua uug uur uus uut uuu