License
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- Attribution-NonCommercial-NoDerivatives 4.0 (CC BY-NC-ND 4.0)34
- Public Domain Mark 1.033
- Attribution-NonCommercial-NoDerivs 3.0 United States26
- Attribution-NonCommercial 4.0 (CC BY-NC 4.0)17
- Attribution-NonCommercial-ShareAlike 3.0 United States5
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- Attribution-ShareAlike 4.0 (CC BY-SA 4.0)1