a-a a-b a-t aaa aab aan aat aau aay ab- aba abb abn abt abu aby an- ana anb ann ant anu any at- ata atb atn att atu au- aua aub aun aut ay- aya ayn ayt ayu b-u baa bab ban bat bau bay bba bbb bbn bbt bbu bby bna bnb bnn bnt bnu bta btb btn btt btu bty bua bub bun but buu buy by- bya byn byt byu naa nab nan nat nau nay nba nbb nbn nbt nbu nna nnb nnn nnt nnu nta ntb ntn ntt ntu nua nub nun nut nuu nuy nya nyn nyt nyu nyy taa tab tan tat tau tay tba tbb tbn tbt tbu tna tnb tnn tnt tta ttb ttn ttt ttu tty tua tub tun tut tuu tuy tya tyn tyt ua- uaa uab uan uat uau uay uba ubb ubn ubt ubu uby un- una unb unn unt unu uny uta utb utn utt utu uty uua uun uut uuu uyu yaa yab yan yat yau yay yby yna ynn ynu yny yta ytn ytt ytu yua yun yut yuu yuy yyb yyt yyu yyy