Result of Combinatorics.Permutations(array) method does not include the original array

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What steps will reproduce the problem?
1. var result = Combinatorics.Permutations(new [] { 1, 2 }).ToList();
2. result: {{2, 1}}

What is the expected output? What do you see instead?

Expected output is {{1, 2}, {2, 1}}.
Observed output is {{2, 1}}

What version of the product are you using? On what operating system?

Accord.NET 2.12; Windows 7 x64

Please provide any additional information below.

For definitions of permutation see:
http://en.wikipedia.org/wiki/Permutation
http://mathworld.wolfram.com/Permutation.html

Original issue reported on code.google.com by olkoro...@gmail.com on 5 Jul 2014 at 8:45

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Thanks! Will be fixed in the next release (2.13).

Original comment by cesarso...@gmail.com on 5 Jul 2014 at 6:44

• Changed state: Accepted

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Original comment by cesarso...@gmail.com on 8 Aug 2014 at 10:03

• Changed state: Started

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Available on release 2.13.

Original comment by cesarso...@gmail.com on 19 Aug 2014 at 8:34

• Changed state: Fixed