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Hello,
The edge15 table that you created earlier has 4 columns; time, edge, qty, numTrds. What this question is asking, is that you create a dictionary which takes the edge, qty, numTrds columns from the edge15 table. So your result should be a dictionary with 3 elements, with each value being the list of aggregated numbers from the edge15 table. I hope this clarification helps.
Many Thanks
Luke