-ic a-a a-b a-c a-i aaa aab aac aag aai aan ab- aba abb abc abg abi abn ac- aca acb acc acg aci acn ag- aga agb agc agg agi agn ai- aia aib aic aig aii ain an- ana anb anc ang ani ann baa bab bac bag bai ban bba bbb bbc bbg bbi bbn bca bcb bcc bcg bci bcn bga bgb bgc bgg bgi bgn bi- bia bib bic big bii bin bna bnb bnc bng bni bnn c-- caa cab cac cag cai can cba cbb cbc cbg cbi cbn cca ccb ccc ccg cci ccn cga cgb cgc cgg cgi cgn ci- cia cib cic cig cii cin cn- cna cnb cnc cng cni cnn gaa gab gac gag gai gan gba gbc gbg gbi gbn gca gcb gcc gcg gci gcn gga ggb ggc ggg ggi ggn gia gib gic gig gii gin gna gnb gnc gni gnn ia- iaa iab iac iag iai ian iba ibb ibc ibg ibi ibn ica icb icc icg ici icn iga igb igc igg igi ign iia iib iic iii iin in- ina inb inc ing ini inn n-i naa nab nac nag nai nan nba nbb nbc nbg nbi nbn nca ncb ncc ncg nci ncn nga ngb ngc ngg ngi ngn nia nib nic nig nii nin nna nnb nnc nng nni nnn