-ic a-a a-b a-c a-i aaa aab aac aae aag aai ab- aba abb abc abe abg abi ac- aca acb acc ace acg aci aea aeb aec aee aeg aei ag- aga agb agc age agg agi ai- aia aib aic aie aig aii baa bab bac bae bag bai bba bbb bbc bbe bbg bbi bca bcb bcc bce bcg bci be- bea beb bec bee beg bei bga bgb bgc bge bgg bgi bi- bia bib bic bie big bii c-- caa cab cac cae cag cai cba cbb cbc cbe cbg cbi cca ccb ccc cce ccg cci ce- cea ceb cec cee ceg cei cga cgb cgc cge cgg cgi ci- cia cib cic cie cig cii eaa eab eac eae eag eai eba ebb ebc ebe ebg ebi ec- eca ecb ecc ece ecg eci eea eeb eec eee eeg ega egb egc ege egg egi eia eib eic eie eig eii gaa gab gac gae gag gai gba gbc gbe gbg gbi gca gcb gcc gce gcg gci ge- gea geb gec gee geg gei gga ggb ggc ggg ggi gia gib gic gie gig gii ia- iaa iab iac iae iag iai iba ibb ibc ibe ibg ibi ica icb icc ice icg ici ie- iea iec iee ieg iei iga igb igc ige igg igi iia iib iic iie iii