Exercise 4.1: Multidimensional Dot Products

Given: two three_dimensional arrays, x and y, of equal size and range;
Compose: a loop that returns an array of dot (or inner) product of each pair of corresponding rows.

for x_row in x dot y_row in y
returns array of for i in 1, row_size
                 returns value of sum x_row[i] * y_row[i]
                 end for
end for

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