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If the stack's head is 8, return the stack unchanged. If the stack's head is not 8, change the head to have a value 8 more than it currently has.


stackHeadPlus8([8]) → [8]
stackHeadPlus8([2]) → [10]
stackHeadPlus8([1, 4, 9]) → [1, 4, 17]

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public ArrayList<Integer> stackHeadPlus8(ArrayList<Integer> list) { }

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