a-a a-b aaa aab aad aae aaf aag ab- aba abb abd abe abf abg ad- ada adb add ade adf adg aea aeb aed aee aef aeg af- afa afb afd afe aff afg ag- aga agb agd age agf agg baa bab bad bae baf bag bba bbb bbd bbe bbf bbg bda bdb bdd bde bdf bdg be- bea beb bed bee bef beg bfa bfb bfd bfe bff bfg bga bgb bgd bge bgf bgg daa dab dad dae daf dag dba dbb dbd dbe dbf dbg dda ddb ddd dde ddf ddg de- dea deb ded dee def deg dfa dfb dfd dfe dff dfg dga dgd dge dgf dgg eaa eab ead eae eaf eag eba ebb ebd ebe ebf ebg ed- eda edb edd ede edf edg eea eeb eed eee eef eeg ef- efa efb efd efe eff efg ega egb egd ege egf egg faa fab fad fae faf fag fba fbb fbd fbe fbf fbg fda fdb fdd fde fdf fdg fea feb fed fee fef feg ffa ffd ffe fff ffg fga fgb fgd fge fgf fgg g-d gaa gab gad gae gaf gag gba gbd gbe gbf gbg gda gdb gdd gde gdf ge- gea geb ged gee gef geg gfa gfb gfd gfe gff gga ggb ggd ggg