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$RandomState
$RandomState gives a representation of the internal state of the pseudorandom generator used by Random.
The value of $RandomState changes every time Random is called.
You can use s
=
$RandomState to explicitly save the value of $RandomState, and $RandomState
=
s to restore.
The value of $RandomState is always a long integer chosen from a certain large set of possibilities. You can assign $RandomState only to values in this set.
You can use Block[
$RandomState
,
expr
] to localize the value of $RandomState during the evaluation of expr.
$RandomState
,
expr
] to localize the value of $RandomState during the evaluation of expr. 
