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Given a string S, we can transform every letter individually to be lowercase or uppercase to create another string.
Return a list of all possible strings we could create. You can return the output in any order.
Input: S = "a1b2"
Input: S = "3z4"
Input: S = "12345"
Input: S = "0"
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Don't forget to take in-depth look at the other backtracking problems because that is what would get you comfortable with using the backtracking template and master the art of Backtracking:
- Letter Case Permutation
- Power Set
- All Paths Between Two Nodes
- Word Search
- Word Square
- Generate Parentheses
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