#### Exercise 3.3: Vector Sum and Difference

Given: two vectors, `x`, and `y`, of equal size and range;

Compose: a loop that returns four vectors, containing, respectively, the element-wise sum and difference of the two vectors, and the sums of the elements in each of the two vectors.

for in 1, size
returns array of x[i] + y[i]
array of x[i] - y[i]
value of sum x[i]
value of sum y[i]
end for

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