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frew@mclean.com > stackHead22
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Ensure the stack's head is 2, 2.


stackHead22([1, 4, 9]) → [1, 4, 9, 2, 2]
stackHead22([3, 4, 2, 9]) → [3, 4, 2, 9, 2, 2]
stackHead22([4, 9, 3, 2]) → [4, 9, 3, 2, 2]

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public ArrayList<Integer> stackHead22(ArrayList<Integer> list) { }

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