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This section includes a couple of predefined functions which, in some
sense create new values.
returns the system time in seconds since 00:00 Universal Coordinated Time,
January 1, 1970. The value returned is of type double.
returns a random integer.
returns n random integers.
returns a random integer which is greater than or equal to start and
less than or equal to stop.
Thu Nov 13 16:44:05 EST 1997