a-a a-b a-c aaa aab aac aae aag ab- aba abb abc abe abg ac- aca acb acc ace acg aea aeb aec aee aeg ag- aga agb agc age agg baa bab bac bae bag bba bbb bbc bbe bbg bca bcb bcc bce bcg be- bea beb bec bee beg bga bgb bgc bge bgg c-- caa cab cac cae cag cba cbb cbc cbe cbg cca ccb ccc cce ccg ce- cea ceb cec cee ceg cga cgb cgc cge cgg eaa eab eac eae eag eba ebb ebc ebe ebg ec- eca ecb ecc ece ecg eea eeb eec eee eeg ega egb egc ege egg gaa gab gac gae gag gba gbc gbe gbg gca gcb gcc gce gcg ge- gea geb gec gee geg gga ggb ggc ggg