a-a a-b a-c aaa aab aac aae aag aah ab- aba abb abc abe abg abh ac- aca acb acc ace acg ach aea aeb aec aee aeg aeh ag- aga agb agc age agg agh aha ahb ahc ahe ahg ahh baa bab bac bae bag bah bba bbb bbc bbe bbg bbh bca bcb bcc bce bcg bch be- bea beb bec bee beg beh bga bgb bgc bge bgg bgh bha bhb bhc bhe bhg bhh c-- caa cab cac cae cag cah cba cbb cbc cbe cbg cbh cca ccb ccc cce ccg cch ce- cea ceb cec cee ceg ceh cga cgb cgc cge cgg cgh ch- cha chb chc che chg chh eaa eab eac eae eag eah eba ebb ebc ebe ebg ebh ec- eca ecb ecc ece ecg ech eea eeb eec eee eeg ega egb egc ege egg egh eha ehb ehc ehe ehg ehh gaa gab gac gae gag gah gba gbc gbe gbg gbh gca gcb gcc gce gcg gch ge- gea geb gec gee geg geh gga ggb ggc ggg ggh gha ghb ghc ghe ghg ghh haa hab hac hae hag hah hba hbb hbc hbe hbg hbh hca hcb hcc hce hcg hch he- hea heb hec hee heg heh hga hgb hgc hge hgg hgh hha hhb hhc hhe hhg hhh