Creating an array

I'm trying to create the ability to select nodes at random (easy enough),
however I'm getting duplicates. I've tried to create a string (an array if
you will) of numbers that I generated that I can check each time I loop
through the nodes, but if it is possible, it's outside of my current xsl
understanding.

Is it possible to build a delimited string/array? Or does anyone have
suggestions on how to eliminate duplicates while generating random numbers
in the first place?

TIA,
Alan   


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