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Given a binary tree, Print All the Nodes that don't have Siblings.
Objective: Given a binary tree, Print All the Nodes that don't have siblings.
Note: sibling node is the node which has the same parent, so you need to print the nodes who is a single child of his parent.
Input: A binary tree.
Example:

Approach:
- Do the inorder traversal.
- check if the node has only a child, if yes then print that child.
Code:
Output:
Nodes with No Siblings: 6 7 8 9
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