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(librep.info)Random Numbers

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Pseudo-Random Numbers
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   The `random' function allows pseudo-random numbers to be generated.

 - Function: random #!optional limit
     Return a pseudo-random number between zero and LIMIT-1 inclusive.
     If LIMIT is undefined, it is taken as being the largest positive
     integer representable in a fixnum.

     Calling `random' with LIMIT equal to the symbol `t' seeds the
     generator with the current time of day.