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frew@mclean.com > stackHead7
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Ensure the stack's head is 7.


stackHead7([1, 4, 9]) → [1, 4, 9, 7]
stackHead7([3, 4, 7, 9]) → [3, 4, 7, 9, 7]
stackHead7([4, 9, 3, 7]) → [4, 9, 3, 7]

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public ArrayList<Integer> stackHead7(ArrayList<Integer> list) { }

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