a-a a-b a-i a-t aaa aab aag aai aan aao aat ab- aba abb abg abi abn abo abt ag- aga agb agg agi agn ago agt ai- aia aib aig aii ain aio ait an- ana anb ang ani ann ano ant aoa aob aog aoi aon aoo aot at- ata atb atg ati atn ato att baa bab bag bai ban bao bat bba bbb bbg bbi bbn bbo bbt bga bgb bgg bgi bgn bgo bgt bi- bia bib big bii bin bio bit bna bnb bng bni bnn bno bnt boa bob bog boi bon boo bot bta btb btg bti btn bto btt gaa gab gag gai gan gao gat gba gbg gbi gbn gbo gbt gga ggb ggg ggi ggn ggo ggt gia gib gig gii gin gio git gna gnb gni gnn gno gnt goa gob gog goi gon goo got gta gtb gtg gti gtn gto gtt ia- iaa iab iag iai ian iao iat iba ibb ibg ibi ibn ibo ibt iga igb igg igi ign igo igt iia iib iii iin iio iit in- ina inb ing ini inn ino int io- ioa iob iog ioi ion ioo iot ita itb itg iti itn ito itt n-i naa nab nag nai nan nao nat nba nbb nbg nbi nbn nbo nbt nga ngb ngg ngi ngn ngo ngt nia nib nig nii nin nio nit nna nnb nng nni nnn nno nnt no- noa nob nog noi non noo not nta ntb ntg nti ntn nto ntt o-i oaa oab oag oai oan oao oat ob- oba obb obg obi obn obo obt oga ogg ogi ogn ogo ogt oia oib oii oin oio oit on- ona onb ong oni onn ono ont oo- ooa oob oog ooi oon ooo oot ot- ota otb otg oti otn oto ott taa tab tag tai tan tao tat tba tbb tbg tbi tbn tbo tbt tga tgb tgg tgi tgn tgo tgt tia tib tig tii tin tio tit tna tnb tng tni tnn tno tnt to- toa tob tog toi ton too tot tta ttb ttg tti ttn tto ttt