Problem 1124. String permutations on phone keyboard

Given a number such as 2639 return all possible string permutations using the phone-keyboard on Problem 1069.
input = 78
output = {'pt';'pu';'pv';'qt';'qu';'qv';'rt';'ru';'rv';'st';'su';'sv'}
Solve

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49.3% Correct | 50.7% Incorrect
Last Solution submitted on Jan 03, 2026

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