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Returns a pseudo-random number. The term "pseudo-random"
is used as randomization is done using the Posix rand and
srand functions. While these routines do provide satisfactory
randomization for most applications, the numbers generated
are not entirely random.
If seed is specified, it is used to start the random number
generator. Note that only a single $random stream can be used
in the process. If there are multiple $random functions in
a select, only the first seed is used. Seed must be a literal.
The return value is INTEGER length 4.
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