Comment (by Zach Etienne):

The Cottonmouth thorn can be found in this repo:

https://github.com/EinsteinToolkit/Cottonmouth

The code that generates Cottonmouth (EinsteinEngine) can be found in this repo:

git clone https://github.com/max-morris/EinsteinEngine.git

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2916/include-cottonmouth