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

Copyright (c) 2026 Yuyu Luo (methodology) and contributors.

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:

- Attribution — You must give appropriate credit, provide a link to the
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- 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.

No additional restrictions. You may not apply legal terms or technological
measures that legally restrict others from doing anything the license permits.

Full license text: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
