a-a a-b a-t aaa aab aag aat aau aay ab- aba abb abg abt abu aby ag- aga agb agg agt agu agy at- ata atb atg att atu au- aua aub aug aut ay- aya ayt ayu b-u baa bab bag bat bau bay bba bbb bbg bbt bbu bby bga bgb bgg bgt bgu bta btb btg btt btu bty bua bub bug but buu buy by- bya byg byt byu gaa gab gag gat gau gay gba gbg gbt gbu gby gga ggb ggg ggt ggu gta gtb gtg gtt gtu gty gu- gua gub gug gut guu guy gy- gya gyb taa tab tag tat tau tay tba tbb tbg tbt tbu tga tgb tgg tgt tgu tgy tta ttb ttg ttt ttu tty tua tub tug tut tuu tuy tya tyg tyt ua- uaa uab uag uat uau uay uba ubb ubg ubt ubu uby uga ugb ugg ugt ugu uta utb utt utu uty uua uug uut uuu uyu yaa yab yag yat yau yay ybg yby yga yta ytt ytu yua yug yut yuu yuy yyb yyg yyt yyu yyy