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The tutorial discusses solving letter combinations of a phone number, where only digits 2 through 9 are used. The goal is to return all possible letter combinations each number could represent, similar to old phone texting. Each digit from 2 to 9 is mapped to specific characters - for example, two is mapped to a, b, c, and so on. Different numbers are mapped to different numbers of characters. The tutorial illustrates how to implement this logic for a given string of digits.
