words.json, levels.json and daily.json are derived from Lexique 4, by Boris New,
Christophe Pallier and contributors: https://www.lexique.org/

They are shared under the Creative Commons Attribution-ShareAlike 4.0 license:
https://creativecommons.org/licenses/by-sa/4.0/

Changes: filtered to common word forms, reduced to spelling and syllables, and
used to generate puzzles.