a-a a-b a-i aaa aab aag aai aan ab- aba abb abg abi abn ag- aga agb agg agi agn ai- aia aib aig aii ain an- ana anb ang ani ann baa bab bag bai ban bba bbb bbg bbi bbn bga bgb bgg bgi bgn bi- bia bib big bii bin bna bnb bng bni bnn gaa gab gag gai gan gba gbg gbi gbn gga ggb ggg ggi ggn gia gib gig gii gin gna gnb gni gnn ia- iaa iab iag iai ian iba ibb ibg ibi ibn iga igb igg igi ign iia iib iii iin in- ina inb ing ini inn n-i naa nab nag nai nan nba nbb nbg nbi nbn nga ngb ngg ngi ngn nia nib nig nii nin nna nnb nng nni nnn