License
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- Attribution 4.0 (CC BY 4.0)608
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- Attribution-NonCommercial-NoDerivs 3.0 United States151
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- Public Domain Mark 1.069
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- Attribution-NonCommercial-ShareAlike 3.0 United States22
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- Attribution-NonCommercial 3.0 United States11
- Attribution-NoDerivatives 4.0 (CC BY-ND 4.0)8
- Attribution-ShareAlike 3.0 United States4
- Apache 2.01