a-a a-b a-c aaa aab aac aad aae aaf aag ab- aba abb abc abd abe abf abg ac- aca acb acc acd ace acf acg ad- ada adb adc add ade adf adg aea aeb aec aed aee aef aeg af- afa afb afc afd afe aff afg ag- aga agb agc agd age agf agg baa bab bac bad bae baf bag bba bbb bbc bbd bbe bbf bbg bca bcb bcc bcd bce bcf bcg bda bdb bdc bdd bde bdf bdg be- bea beb bec bed bee bef beg bfa bfb bfc bfd bfe bff bfg bga bgb bgc bgd bge bgf bgg c-- caa cab cac cad cae caf cag cba cbb cbc cbd cbe cbf cbg cca ccb ccc ccd cce ccf ccg cda cdb cdc cdd cde cdf cdg ce- cea ceb cec ced cee cef ceg cfa cfb cfc cfd cfe cff cfg cga cgb cgc cgd cge cgg daa dab dac dad dae daf dag dba dbb dbc dbd dbe dbf dbg dca dcb dcc dcd dce dcf dcg dda ddb ddc ddd dde ddf ddg de- dea deb dec ded dee def deg dfa dfb dfc dfd dfe dff dfg dga dgc dgd dge dgf dgg eaa eab eac ead eae eaf eag eba ebb ebc ebd ebe ebf ebg ec- eca ecb ecc ecd ece ecf ecg ed- eda edb edc edd ede edf edg eea eeb eec eed eee eef eeg ef- efa efb efc efd efe eff efg ega egb egc egd ege egf egg faa fab fac fad fae faf fag fba fbb fbc fbd fbe fbf fbg fca fcb fcc fcd fce fcf fcg fda fdb fdc fdd fde fdf fdg fea feb fec fed fee fef feg ffa ffc ffd ffe fff ffg fga fgb fgc fgd fge fgf fgg g-d gaa gab gac gad gae gaf gag gba gbc gbd gbe gbf gbg gca gcb gcc gcd gce gcf gcg gda gdb gdc gdd gde gdf ge- gea geb gec ged gee gef geg gfa gfb gfc gfd gfe gff gga ggb ggc ggd ggg