a-a a-b a-i a-t aaa aab aad aai aan aat ab- aba abb abd abi abn abt ad- ada adb add adi adn adt ai- aia aib aid aii ain ait an- ana anb and ani ann ant at- ata atb atd ati atn att baa bab bad bai ban bat bba bbb bbd bbi bbn bbt bda bdb bdd bdi bdt bi- bia bib bid bii bin bit bna bnb bnd bni bnn bnt bta btb btd bti btn btt daa dab dad dai dan dat dba dbb dbd dbi dbn dbt dda ddb ddd ddi ddn ddt di- dia dib did dii din dit dna dnb dnd dni dnn dnt dta dtb dtd dti dtn dtt i-d ia- iaa iab iad iai ian iat iba ibb ibd ibi ibn ibt ida idb idd idi idn idt iia iib iid iii iin iit in- ina inb ind ini inn int ita itb itd iti itn itt n-i naa nab nad nai nan nat nba nbb nbd nbi nbn nbt nda ndb ndd ndi ndn ndt nia nib nid nii nin nit nna nnb nni nnn nnt nta ntb ntd nti ntn ntt taa tab tad tai tan tat tba tbb tbd tbi tbn tbt tda tdb tdd tdi tdn tdt tia tib tid tii tin tit tna tnb tnd tni tnn tnt tta ttb ttd tti ttn ttt