🧠 Before you code — what pattern fits?
Given a string containing digits 2-9, return all possible letter combinations the number could represent on a phone keypad, in any order.
"23" → ["ad","ae","af","bd","be","bf","cd","ce","cf"]
"" → []
🎬 Video explanation · NeetCode
Your solution runs against 3 unit tests, including edge and large-value cases.
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Test console · 3 unit tests
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