a-a a-b a-i a-t aaa aab aad aai aat ab- aba abb abd abi abt ad- ada adb add adi adt ai- aia aib aid aii ait at- ata atb atd ati att baa bab bad bai bat bba bbb bbd bbi bbt bda bdb bdd bdi bdt bi- bia bib bid bii bit bta btb btd bti btt daa dab dad dai dat dba dbb dbd dbi dbt dda ddb ddd ddi ddt di- dia dib did dii dit dta dtb dtd dti dtt i-d ia- iaa iab iad iai iat iba ibb ibd ibi ibt ida idb idd idi idt iia iib iid iii iit ita itb itd iti itt taa tab tad tai tat tba tbb tbd tbi tbt tda tdb tdd tdi tdt tia tib tid tii tit tta ttb ttd tti ttt