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Array-1 > plusTwo
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Given 2 int arrays, each length 2, return a new array length 4 containing all their elements.

plusTwo([1, 2], [3, 4]) → [1, 2, 3, 4]
plusTwo([4, 4], [2, 2]) → [4, 4, 2, 2]
plusTwo([9, 2], [3, 4]) → [9, 2, 3, 4]

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public int[] plusTwo(int[] a, int[] b) { }


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