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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:
attr_accessor :value, :next
@value = value
@next = nil
a = LinkedListNode.new('A')
b = LinkedListNode.new('B')
c = LinkedListNode.new('C')
a.next = b
b.next = c
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