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A 6-character code is assembled from the letters A,B,C,D and digits 0-9.
Find the total number of possible codes if
the letters and digits can be reused,
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the letters and digits cannot be reused.
Now it is given that all 4 letters are used once and digits cannot be reused, and that no 3 letters can be consecutive.
Find the number of possible codes under these conditions.
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