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Pyramid Array
Write a function that when given a number >= 0, returns an Array of ascending length subarrays.
pyramid(0) =>
[]pyramid(1) =>
[ [1] ]pyramid(2) =>
[ [1], [1, 1] ]pyramid(3) =>
[ [1], [1, 1], [1, 1, 1] ]
Note: the subarrays should be filled with 1s