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Old Cellphone Keypad

You can find the problem here: https://drive.google.com/file/d/1Dptu4tMC5TvYxkdF-6UwWEVxeXm96JET/view?usp=sharing

HINT LADDERno hints yet
L1 Observation
L2 Technique
L3 Approach
L4 Pseudo-code
🔒
L5 Full solution
L5 unlocks only if you insist twice
solution.cppC++17

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