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Outside a​ home, there is a 5​-key keypad with letters Upper A comma Upper B comma...

Outside a​ home, there is a 5​-key keypad with letters Upper A comma Upper B comma Upper C comma Upper D and comma Upper E that can be used to open the garage if the correct five​-letter code is entered. Each key may be used only once. How many codes are​ possible? The number of possible codes is nothing.

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