1. How does indexing work?
2. What are the SOLID principles?
3. Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if:\n\n1. Open brackets must be closed by the same type of brackets.\n2. Open brackets must be closed in the correct order.\n\nReturn true if the string is valid; otherwise, return false.
4. What is the process of authentication and how does JSON Web Token (JWT) work?
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