The contents of this book are licenced under the Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0). The full version of the licence is available: [[https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode][here].

The human readable summary (not a substitute for the full version) is:

You are free to:

• Share — copy and redistribute the material in any medium or format
• Adapt — remix, transform, and build upon the material
• The licensor cannot revoke these freedoms as long as you follow the license terms.