License
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- Attribution 4.0 (CC BY 4.0)756
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- Public Domain Mark 1.075
- Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0)72
- Attribution-NonCommercial-NoDerivs 3.0 United States61
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- Attribution-NonCommercial-ShareAlike 4.0 (CC BY-NC-SA 4.0)30
- Attribution-ShareAlike 4.0 (CC BY-SA 4.0)30
- Attribution-NonCommercial-ShareAlike 3.0 United States12
- Attribution-NoDerivs 3.0 United States6
- Attribution-NonCommercial 3.0 United States6
- Attribution-NoDerivatives 4.0 (CC BY-ND 4.0)5
- Attribution-ShareAlike 3.0 United States3
- Apache 2.01