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class Node: def __init__(self, data): self.data = data self.next = None class LinkedList: def __init__(self): self.head = Node() def append(self, data): new_node = Node(data) cur = self.head while cur.next != None: cur = cur.next cur.next = new_node node1 = Node(42) node2 = Node(5) node1.next = node2 node2.next = node1 list1 = LinkedList() print(list1.append(node1))