Five different letters.
5!
5 * 4 * 3 * 2
= 120 ways
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The nine letters in chocolate can be rearranged in 362,880 different ways.
There are 24.
There are 172 different arrangements.
There are 6! = 720 different arrangements.
If you assume 26 different letters, there are 26 to the power 5 possible variations of 5 letters.