License
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- Attribution 4.0 (CC BY 4.0)735
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- Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0)77
- Public Domain Mark 1.073
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- CC0 1.0 Universal57
- Attribution-ShareAlike 4.0 (CC BY-SA 4.0)36
- Attribution-NonCommercial-ShareAlike 4.0 (CC BY-NC-SA 4.0)31
- Attribution-NonCommercial-ShareAlike 3.0 United States15
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- Attribution-NoDerivs 3.0 United States7
- Attribution-NonCommercial 3.0 United States7
- Attribution-ShareAlike 3.0 United States2
- Apache 2.01