I'm trying to generate 8 unique random numbers between 1 and 13.

for example my first set of results could be:

2, 8, 4, 6, 3, 10, 12, 1

the results need to be between 1 and 13 and they must be unique.

The rand(12) + 1 returns random numbers between 1 and 13, but they are
not unique.  Any quick solutions?
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