*4.7. Code Availability*

Python 3.6 code to download and pre-process all PG books can be obtained at https://github. com/pgcorpus/gutenberg, while python-based jupyter notebooks that reproduce the results of this manuscript can be obtained at https://github.com/pgcorpus/gutenberg-analysis.

**Author Contributions:** Conceptualization, M.G. and F.F.-C.; Software, M.G. and F.F.-C.; Data Curation, M.G. and F.F.-C.; Writing—Original Draft Preparation, M.G. and F.F.-C. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding. F.F.-C. paid the APC.

**Conflicts of Interest:** The authors declare no conflict of interest.
