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Column totals of a two-dimensional list
Construct a Snap! program that receives a rectangular two-dimensional list of integers and reports a one-dimensional list containing the sum of each column, from left to right.
For example, for [[1,2,3],[4,5,6]], the result is [5,7,9]. Your solution should handle negative values, one row, and different matrix dimensions.
The editor starts with a fixed assessment script. The orange input reporter provides the two-dimensional list; the orange evaluation assignment receives the column totals. Connect your own blocks between these to produce the required result. The system controls input values and evaluates the output. The fixed script must remain part of your submission.
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