ReplaceList
 Usage
Notes
 Further Examples
Replace returns the first possible result obtained by applying a rule.
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If a single rule can be applied in several ways, ReplaceList gives a list of all possible results.
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ReplaceList gives a list of all possible results from each rule that applies.
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Here only the first  results are given.
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The defined function ReplaceAllList extends ReplaceList to also work on all subexpressions.
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Here is a function that returns all permutations of the list {1, 1, 2, 2, ... , n, n}, such that there is 1 number between the two occurrences of 1, 2 numbers between the two occurrences of 2,... and n numbers between the two occurrences of n.
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