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AI Features

Letter Case Permutation

Explore how to generate all possible variations of a string by changing each letter's case independently while digits remain unchanged. Understand the problem constraints and practice implementing solutions to efficiently produce all letter case permutations.

Statement

Given a string, s, consisting of letters and digits, generate all possible variations by modifying each letter independently to be either lowercase or uppercase while keeping the digits unchanged. Each letter in the s string can appear in both cases across different variations, resulting in multiple possible combinations. Return a list containing all such variations in any order.

Constraints: ...