FiveLetterWords' study tables, analysis code outputs, documentation and graphics are licensed under CC BY 4.0. Credit FiveLetterWords.io and the What makes a Wordle hard? v1 release.

Glasgow Norms familiarity data are adapted under CC BY 4.0. Source: Scott, Keitel, Becirspahic, Yao & Sereno (2019), “The Glasgow Norms: Ratings of 5,500 words on nine scales”, Behavior Research Methods 51:1258-1270, DOI 10.3758/s13428-018-1099-3 (https://doi.org/10.3758/s13428-018-1099-3); licence https://creativecommons.org/licenses/by/4.0/. Retain that creator/source attribution with reused familiarity data. The CC BY licence requires creator credit, but no hyperlink is required. The preserved answer-pool source in the upstream research release remains under its recorded upstream terms and is not republished here.