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- Attribution-NonCommercial-NoDerivs 3.0 United States7
- Attribution 4.0 (CC BY 4.0)6
- Public Domain Mark 1.04
- Attribution 3.0 United States2
- Attribution-NonCommercial 4.0 (CC BY-NC 4.0)2
- Attribution-NonCommercial-ShareAlike 4.0 (CC BY-NC-SA 4.0)2
- Attribution-NonCommercial-ShareAlike 3.0 United States1
- Attribution-ShareAlike 4.0 (CC BY-SA 4.0)1