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- PUB6
- http://creativecommons.org/licenses/by-nc/4.0/2
- Creative Commons - Attribution 4.0 International (CC BY 4.0)1
- Creative Commons - Attribution-NoDerivatives 4.0 International (CC BY-ND 4.0)1
- Creative Commons - Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)1
- Creative Commons - Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)1
- Creative Commons - Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)1
- Creative Commons - Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)1
- http://creativecommons.org/licenses/by-nc-nd/4.0/1
- http://creativecommons.org/licenses/by-nc-sa/4.0/1
- http://creativecommons.org/licenses/by-sa/4.0/1
- http://creativecommons.org/licenses/by/4.0/1