In both of the functions for this exercise, you used the double-accumulator pattern to produce the result. In one case it was to produce a

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In both of the functions for this exercise, you used the double-accumulator pattern to produce the result. In one case it was to produce a list of numbers, and in another case it was to produce a completely new table. The double-accumulator pattern is very common for functions on 2D lists, but it is not always necessary. Can you think of an application that only needs a single accumulator on a 2D list