1. Given a binary tree, print the left view of it. The left view of a binary tree is the set of nodes visible when the tree is viewed from the left side.
2. Write a program to print the leftmost node at each level of a binary tree using Breadth-First Search (BFS).
3. Given an array, find all the pairs present in it.
4. How did you tackle a client escalation, and how did you manage to extend customer loyalty and retention?
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