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Outside a home, there is a 5-key keypad with letters A, B, C, D and, E that can be used to open the garage if

Outside a home, there is a 5-key keypad with letters A, B, C, D and, 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 =

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