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The tutorial discusses solving letter combinations of a phone number using a string of digits ranging from 2 to 9. Each digit is mapped to a set of characters, such as 2 to "abc" and 3 to "def". The goal is to return all possible letter combinations the number could represent, as when texting on old phones. The problem only considers digits 2 to 9, as 1 is not mapped to any characters. Each digit maps to a range of characters, with some having more options than others.
