License
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- Attribution-NonCommercial-NoDerivs 3.0 United States13
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- Public Domain Mark 1.07
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- Apache 2.01
- Attribution-NoDerivatives 4.0 (CC BY-ND 4.0)1
- Attribution-NonCommercial 3.0 United States1
- Attribution-NonCommercial-ShareAlike 3.0 United States1