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- policy:public59
- http://creativecommons.org/publicdomain/mark/1.0/37
- http://creativecommons.org/licenses/by-nc-sa/4.0/25
- unknown7
- PUB4
- Creative Commons - Attribution 4.0 International (CC BY 4.0)2
- http://creativecommons.org/licenses/by/4.0/2
- open access2
- policy:private2
- Creative Commons - Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)1
- GNU General Public Licence, version 31
- http://opensource.org/licenses/GPL-3.01