a-a a-b a-i a-t aaa aab aaf aai aak aan aat ab- aba abb abf abi abk abn abt af- afa afb aff afi afk afn aft ai- aia aib aif aii aik ain ait aka akb aki akk akn an- ana anb anf ani ank ann ant at- ata atb atf ati atn att baa bab baf bai bak ban bat bba bbb bbf bbi bbk bbn bbt bfa bfb bff bfi bfn bft bi- bia bib bif bii bik bin bit bka bkb bkf bkk bkn bkt bna bnb bnf bni bnk bnn bnt bta btb btf bti btk btn btt faa fab faf fai fak fan fat fba fbb fbf fbi fbk fbn fbt ffa fff ffi ffk ffn fft fia fib fif fii fik fin fit fka fkb fkf fki fkk fkt fna fnb fnf fni fnk fnn fnt fta ftb ftf fti ftk ftn ftt i-f ia- iaa iab iaf iai ian iat iba ibb ibf ibi ibk ibn ibt ifa ifb iff ifi ifn ift iia iib iif iii iin iit ika ikb ikf iki ikk ikt in- ina inb inf ini ink inn int ita itb itf iti itk itn itt k-t ka- kaa kab kaf kai kak kan kat kba kbb kbf kbi kbk kbn kfa kff kfi kia kib kif kii kik kin kit kkb kki kkk kkn kkt kn- kna knf kni knk knn knt kta ktb ktf ktk ktn ktt n-i naa nab naf nai nak nan nat nba nbb nbf nbi nbk nbn nbt nfa nfb nff nfi nfk nfn nft nia nib nif nii nik nin nit nka nkf nki nkk nkn nkt nna nnb nnf nni nnk nnn nnt nta ntb ntf nti ntk ntn ntt taa tab taf tai tak tan tat tba tbb tbf tbi tbk tbn tbt tfa tfb tff tfi tfk tfn tft tia tib tif tii tik tin tit tka tkb tkk tkt tna tnb tnf tni tnk tnn tnt tta ttb ttf tti ttk ttn ttt