a-a a-b a-i aaa aab aag aai aan aax ab- aba abb abg abi abn abx ag- aga agb agg agi agn agx ai- aia aib aig aii ain aix an- ana anb ang ani ann anx ax- axa axi axn axx baa bab bag bai ban bax bba bbb bbg bbi bbn bbx bga bgb bgg bgi bgn bgx bi- bia bib big bii bin bix bna bnb bng bni bnn bnx bxb bxi bxn bxx gaa gab gag gai gan gba gbg gbi gbn gbx gga ggb ggg ggi ggn gia gib gig gii gin gna gnb gni gnn gxa ia- iaa iab iag iai ian iba ibb ibg ibi ibn ibx iga igb igg igi ign iia iib iii iin iix in- ina inb ing ini inn inx ixi ixn n-i naa nab nag nai nan nax nba nbb nbg nbi nbn nbx nga ngb ngg ngi ngn nia nib nig nii nin nix nna nnb nng nni nnn xaa xag xan xbx xgi xia xii xin xix xna xxi xxx