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Find common elements in 2 array lists, returned as an ordered list


common([1, 2, 3], [4, 5, 6, 3]) → [3]
common([1, 2, 3, 4], [3, 2, 1]) → [1, 2, 3]
common([4, 3, 2, 1], [1, 2]) → [1, 2]

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public ArrayList<Integer> common(ArrayList<Integer> nums1, ArrayList<Integer> nums2) { }

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