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Delete a node from a singly-linked list, given only a variable pointing to that node.
The input could, for example, be the variable b below:
def __init__(self, value):
self.value = value
self.next = None
a = LinkedListNode('A')
b = LinkedListNode('B')
c = LinkedListNode('C')
a.next = b
b.next = c
We can do this in time and space! But our answer is tricky, and it could have some side effects...
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