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Outside a​ home, there is aa44​-key keypad with letters Upper A

Outside a​ home, there is aa44​-key keypad with letters Upper A

comma Upper B comma Upper C comma and Upper DA, B, C, and D

that can be used to open the garage if the correct fourfour​-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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