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You have an empty list, and then do the following operations:
What are the contents of the list now?
If we do a PopBack on a list containing the keys (in order) a, b, c, and d, we’ll execute the following part of the code:
p <- head
while p.next.next != nil:
p <- p.next
The loop will start with p pointing to the node containing key a.
How many times will the body of the while loop be executed?