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Outside a home, there is an 8-key keypad with letters A, B, C, D, E, F, G and H that can be used to

Outside a home, there is an 8-key keypad with letters A, B, C, D, E, F, G and H that can be used to open the garage if the correct eight-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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