a-a a-b a-i a-t aaa aab aag aai aas aat aau ab- aba abb abg abi abs abt abu ag- aga agb agg agi ags agt agu ai- aia aib aig aii ais ait aiu as- asa asb asg asi ass ast asu at- ata atb atg ati ats att atu au- aua aub aug aui aus aut b-u baa bab bag bai bas bat bau bba bbb bbg bbi bbs bbt bbu bga bgb bgg bgi bgs bgt bgu bi- bia bib big bii bis bit biu bsa bsb bsg bsi bss bst bsu bta btb btg bti bts btt btu bua bub bug bui bus but buu gaa gab gag gai gas gat gau gba gbg gbi gbs gbt gbu gga ggb ggg ggi ggs ggt ggu gia gib gig gii gis git giu gsa gsb gsg gsi gss gst gsu gta gtb gtg gti gts gtt gtu gu- gua gub gug gui gus gut guu ia- iaa iab iag iai ias iat iau iba ibb ibg ibi ibs ibt ibu iga igb igg igi igs igt igu iia iib iii iis iit iiu is- isa isb isg isi iss ist isu ita itb itg iti its itt itu iu- iua iub iug iui ius iut saa sab sag sai sas sat sau sba sbb sbg sbi sbs sbt sbu sga sgb sgg sgi sgs sgt sgu sia sib sig sii sis sit siu ss- ssa ssb ssg ssi sss sst ssu sta stb stg sti sts stt stu sua sub sug sui sus sut suu taa tab tag tai tas tat tau tba tbb tbg tbi tbs tbt tbu tga tgb tgg tgi tgs tgt tgu tia tib tig tii tis tit tiu tsa tsb tsg tsi tss tst tsu tta ttb ttg tti tts ttt ttu tua tub tug tui tus tut tuu ua- uaa uab uag uai uas uat uau uba ubb ubg ubi ubs ubt ubu uga ugb ugg ugi ugs ugt ugu uia uib uig uii uis uit uiu usa usb usg usi uss ust usu uta utb uti uts utt utu uua uug uus uut uuu