License
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- Attribution 3.0 United States19
- Public Domain Mark 1.018
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- CC0 1.0 Universal8
- Attribution-NonCommercial 4.0 (CC BY-NC 4.0)7
- Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0)4
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- Apache 2.01
- Attribution-NonCommercial 3.0 United States1