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- PUB12
- Creative Commons - Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)4
- Creative Commons - Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)4
- http://creativecommons.org/licenses/by-nc-sa/4.0/4
- http://creativecommons.org/licenses/by-nc/4.0/4
- Creative Commons - Attribution 4.0 International (CC BY 4.0)3
- http://creativecommons.org/licenses/by/4.0/3
- Creative Commons - Attribution 3.0 Unported (CC BY 3.0)1
- Not specified1
- http://creativecommons.org/licenses/by/3.0/1
- http://creativecommons.org/publicdomain/mark/1.0/1
- policy:public1