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- PUB52
- http://creativecommons.org/licenses/by-nc-sa/4.0/21
- Creative Commons - Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)20
- Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)15
- http://creativecommons.org/licenses/by-nc-sa/3.0/15
- Creative Commons - Attribution 4.0 International (CC BY 4.0)7
- http://creativecommons.org/licenses/by/4.0/7
- Creative Commons - Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)3
- http://creativecommons.org/licenses/by-sa/4.0/3
- The MIT License (MIT)2
- http://opensource.org/licenses/mit-license.php2
- Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)1
- Attribution-NonCommercial-NoDerivs 3.0 Unported (CC BY-NC-ND 3.0)1
- Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)1
- Creative Commons - Attribution 3.0 Unported (CC BY 3.0)1
- Public Domain Dedication (CC Zero)1
- http://creativecommons.org/licenses/by-nc-nd/3.0/1
- http://creativecommons.org/licenses/by-nc/3.0/1
- http://creativecommons.org/licenses/by-sa/3.0/1
- http://creativecommons.org/licenses/by/3.0/1