a-a a-b a-t aaa aab aag aao aas aat aau ab- aba abb abg abo abs abt abu ag- aga agb agg ago ags agt agu aoa aob aog aoo aos aot aou as- asa asb asg aso ass ast asu at- ata atb atg ato ats att atu au- aua aub aug auo aus aut b-u baa bab bag bao bas bat bau bba bbb bbg bbo bbs bbt bbu bga bgb bgg bgo bgs bgt bgu boa bob bog boo bos bot bou bsa bsb bsg bso bss bst bsu bta btb btg bto bts btt btu bua bub bug buo bus but buu gaa gab gag gao gas gat gau gba gbg gbo gbs gbt gbu gga ggb ggg ggo ggs ggt ggu goa gob gog goo gos got gou gsa gsb gsg gso gss gst gsu gta gtb gtg gto gts gtt gtu gu- gua gub gug guo gus gut guu oaa oab oag oao oas oat oau ob- oba obb obg obo obs obt obu oga ogg ogo ogs ogt oo- ooa oob oog ooo oos oot os- osa osb osg oso oss ost osu ot- ota otb otg oto ots ott otu ou- oua ouo ous out saa sab sag sao sas sat sau sba sbb sbg sbo sbs sbt sbu sga sgb sgg sgo sgs sgt sgu soa sob sog soo sos sot sou ss- ssa ssb ssg sso sss sst ssu sta stb stg sto sts stt stu sua sub sug suo sus sut suu taa tab tag tao tas tat tau tba tbb tbg tbo tbs tbt tbu tga tgb tgg tgo tgs tgt tgu to- toa tob tog too tos tot tou tsa tsb tsg tso tss tst tsu tta ttb ttg tto tts ttt ttu tua tub tug tuo tus tut tuu ua- uaa uab uag uao uas uat uau uba ubb ubg ubo ubs ubt ubu uga ugb ugg ugo ugs ugt ugu uoa uob uog uoo uos uot usa usb usg uso uss ust usu uta utb uto uts utt utu uua uug uus uut uuu