-ic a-a a-b a-c a-i aaa aab aac aae aag aai aan ab- aba abb abc abe abg abi abn ac- aca acb acc ace acg aci acn aea aeb aec aee aeg aei aen ag- aga agb agc age agg agi agn ai- aia aib aic aie aig aii ain an- ana anb anc ane ang ani ann baa bab bac bae bag bai ban bba bbb bbc bbe bbg bbi bbn bca bcb bcc bce bcg bci bcn be- bea beb bec bee beg bei ben bga bgb bgc bge bgg bgi bgn bi- bia bib bic bie big bii bin bna bnb bnc bne bng bni bnn c-- caa cab cac cae cag cai can cba cbb cbc cbe cbg cbi cbn cca ccb ccc cce ccg cci ccn ce- cea ceb cec cee ceg cei cen cga cgb cgc cge cgg cgi cgn ci- cia cib cic cie cig cii cin cn- cna cnb cnc cne cng cni cnn eaa eab eac eae eag eai ean eba ebb ebc ebe ebg ebi ebn ec- eca ecb ecc ece ecg eci ecn eea eeb eec eee eeg een ega egb egc ege egg egi egn eia eib eic eie eig eii ein en- ena enb enc ene eng eni enn gaa gab gac gae gag gai gan gba gbc gbe gbg gbi gbn gca gcb gcc gce gcg gci gcn ge- gea geb gec gee geg gei gen gga ggb ggc ggg ggi ggn gia gib gic gie gig gii gin gna gnb gnc gne gni gnn ia- iaa iab iac iae iag iai ian iba ibb ibc ibe ibg ibi ibn ica icb icc ice icg ici icn ie- iea iec iee ieg iei ien iga igb igc ige igg igi ign iia iib iic iie iii iin in- ina inb inc ine ing ini inn n-i naa nab nac nae nag nai nan nba nbb nbc nbe nbg nbi nbn nca ncb ncc nce ncg nci ncn ne- nea neb nec nee neg nei nen nga ngb ngc nge ngg ngi ngn nia nib nic nie nig nii nin nna nnb nnc nne nng nni nnn