Day 22: Coding Challenge

• Problem - Given a string containing digits from?2-9?inclusive, return all possible letter combinations that the number could represent. Return the answer in?any order. A mapping of digits to letters (just like on the telephone buttons) is given. Note that 1 does not map to any letters.
• Solution - In this problem, we are going to use recursion and Backtracking to solve the problem.

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