a-a a-b a-i a-t aaa aab aaf aai aan aao aat ab- aba abb abf abi abn abo abt af- afa afb aff afi afn afo aft ai- aia aib aif aii ain aio ait an- ana anb anf ani ann ano ant aoa aob aof aoi aon aoo aot at- ata atb atf ati atn ato att baa bab baf bai ban bao bat bba bbb bbf bbi bbn bbo bbt bfa bfb bff bfi bfn bfo bft bi- bia bib bif bii bin bio bit bna bnb bnf bni bnn bno bnt boa bob bof boi bon boo bot bta btb btf bti btn bto btt faa fab faf fai fan fao fat fba fbb fbf fbi fbn fbo fbt ffa fff ffi ffn ffo fft fia fib fif fii fin fit fna fnb fnf fni fnn fnt foa fob fof foi fon foo fot fta ftb ftf fti ftn fto ftt i-f ia- iaa iab iaf iai ian iao iat iba ibb ibf ibi ibn ibo ibt ifa ifb iff ifi ifn ifo ift iia iib iif iii iin iio iit in- ina inb inf ini inn ino int io- ioa iob iof ioi ion ioo iot ita itb itf iti itn ito itt n-i naa nab naf nai nan nao nat nba nbb nbf nbi nbn nbo nbt nfa nfb nff nfi nfn nfo nft nia nib nif nii nin nio nit nna nnb nnf nni nnn nno nnt no- noa nob nof noi non noo not nta ntb ntf nti ntn nto ntt o-i oaa oab oaf oai oan oao oat ob- oba obb obf obi obn obo obt of- ofa ofb off ofi ofn ofo oft oia oib oif oii oin oio oit on- ona onb onf oni onn ono ont oo- ooa oob oof ooi oon ooo oot ot- ota otb otf oti otn oto ott taa tab taf tai tan tao tat tba tbb tbf tbi tbn tbo tbt tfa tfb tff tfi tfn tfo tft tia tib tif tii tin tio tit tna tnb tnf tni tnn tno tnt to- toa tob tof toi ton too tot tta ttb ttf tti ttn tto ttt