A few examples of five-digit codes that can be created with the cards above are: 1A2B3; AB132; B2A13 .......... (No repetition is allowed) (1) How many unique five-digit codes can be created? (2) (3) How many unique five-digit codes starting with a number can be created? What is the probability that the two letters will never be next to each other in the code?

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