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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)

Copyright (c) Kevin Kortum

This work is licensed under the Creative Commons
Attribution-NonCommercial-ShareAlike 4.0 International License.

You are free to:
  - Share — copy and redistribute the material in any medium or format
  - Adapt — remix, transform, and build upon the material

Under the following terms:
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    license, and indicate if changes were made.
  - NonCommercial — You may not use the material for commercial purposes.
  - ShareAlike — If you remix, transform, or build upon the material, you must
    distribute your contributions under the same license as the original.

Full legal code: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
Summary:         https://creativecommons.org/licenses/by-nc-sa/4.0/