a-a a-b a-i a-t aaa aab aaf aai aan aat ab- aba abb abf abi abn abt af- afa afb aff afi afn aft ai- aia aib aif aii ain ait an- ana anb anf ani ann ant at- ata atb atf ati atn att baa bab baf bai ban bat bba bbb bbf bbi bbn bbt bfa bfb bff bfi bfn bft bi- bia bib bif bii bin bit bna bnb bnf bni bnn bnt bta btb btf bti btn btt faa fab faf fai fan fat fba fbb fbf fbi fbn fbt ffa fff ffi ffn fft fia fib fif fii fin fit fna fnb fnf fni fnn fnt fta ftb ftf fti ftn ftt i-f ia- iaa iab iaf iai ian iat iba ibb ibf ibi ibn ibt ifa ifb iff ifi ifn ift iia iib iif iii iin iit in- ina inb inf ini inn int ita itb itf iti itn itt n-i naa nab naf nai nan nat nba nbb nbf nbi nbn nbt nfa nfb nff nfi nfn nft nia nib nif nii nin nit nna nnb nnf nni nnn nnt nta ntb ntf nti ntn ntt taa tab taf tai tan tat tba tbb tbf tbi tbn tbt tfa tfb tff tfi tfn tft tia tib tif tii tin tit tna tnb tnf tni tnn tnt tta ttb ttf tti ttn ttt