a-a a-b a-q a-t aaa aab aaq aat aau aay ab- aba abb abq abt abu aby aqa aqt at- ata atb att atu au- aua aub aut ay- aya ayt ayu b-u baa bab baq bat bau bay bba bbb bbq bbt bbu bby bqt bta btb btq btt btu bty bua bub but buu buy by- bya byq byt byu qaa qat qau qba qbq qqq qqu qta qtq qty qu- qua qut quy taa tab taq tat tau tay tba tbb tbt tbu tta ttb ttt ttu tty tua tub tut tuu tuy tya tyt ua- uaa uab uaq uat uau uay uba ubb ubt ubu uby uta utb utt utu uty uua uut uuu uyu yaa yab yat yau yay yby yqb yqt yta ytt ytu yua yut yuu yuy yyb yyt yyu yyy