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Today's tutorial will focus on solving letter combinations of a phone number using only digits 2 through 9. We need to return all possible letter combinations each number could represent. This problem arises from old phones where numbers were mapped to characters - e.g., 2 to abc, 3 to def, and so on. Each digit corresponds to a set of characters, with some having up to four options. By inputting a string of digits, we can generate and return all potential letter combinations.
