a-a a-b a-i a-t aaa aab aag aai aak aat ab- aba abb abg abi abk abt ag- aga agb agg agi agk agt ai- aia aib aig aii aik ait aka akb akg aki akk at- ata atb atg ati att baa bab bag bai bak bat bba bbb bbg bbi bbk bbt bga bgb bgg bgi bgk bgt bi- bia bib big bii bik bit bka bkb bkg bkk bkt bta btb btg bti btk btt gaa gab gag gai gak gat gba gbg gbi gbk gbt gga ggb ggg ggi ggt gia gib gig gii gik git gka gkb gkt gta gtb gtg gti gtk gtt ia- iaa iab iag iai iat iba ibb ibg ibi ibk ibt iga igb igg igi igk igt iia iib iii iit ika ikb iki ikk ikt ita itb itg iti itk itt k-t ka- kaa kab kag kai kak kat kba kbb kbi kbk kga kgb kgi kia kib kig kii kik kit kkb kki kkk kkt kta ktb ktg ktk ktt taa tab tag tai tak tat tba tbb tbg tbi tbk tbt tga tgb tgg tgi tgk tgt tia tib tig tii tik tit tka tkb tkg tkk tkt tta ttb ttg tti ttk ttt