License
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- Public Domain Mark 1.066
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- Attribution-NonCommercial-NoDerivs 3.0 United States46
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- Attribution-NonCommercial-ShareAlike 4.0 (CC BY-NC-SA 4.0)25
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- Attribution-NonCommercial-ShareAlike 3.0 United States10
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- Attribution-NoDerivatives 4.0 (CC BY-ND 4.0)5
- Attribution-NoDerivs 3.0 United States5
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- Apache 2.01