1 Crossword question data attribution

This is a collection of question records from separate sources. Retain each record's source and licence when reusing it.

Legacy puzzle records without a sourceId are OpenTriviaQA (CC-BY-SA-4.0), except 1 Crossword originals (also CC-BY-SA-4.0).

OpenTriviaQA: OpenTriviaQA by uberspot and contributors
https://github.com/uberspot/OpenTriviaQA
Licence: CC-BY-SA-4.0 (https://creativecommons.org/licenses/by-sa/4.0/)

Changes: Filtered for standalone quiz questions and 3–10-letter answers; answers uppercased; duplicate questions removed.

TriviaQA: TriviaQA by Mandar Joshi, Eunsol Choi, Daniel Weld and Luke Zettlemoyer (ACL 2017); original question sites retained per record.
https://nlp.cs.washington.edu/triviaqa/
Licence: Apache-2.0 (https://github.com/mandarjoshi90/triviaqa/blob/master/LICENSE)
The upstream repository states that Apache 2.0 applies to code and data. The University of Washington states that it does not own the copyright of the included questions and documents; underlying third-party rights are not independently cleared by this import.
Changes: Selected standalone questions with canonical 3-10-letter answers; whitespace normalised, answers uppercased, duplicates and close lexical variants removed. No evidence documents or answer aliases imported.

Open Trivia DB: Open Trivia Database by PIXELTAIL GAMES LLC and its contributors
https://opentdb.com/api_config.php
Licence: CC-BY-SA-4.0 (https://creativecommons.org/licenses/by-sa/4.0/)

Changes: Multiple-choice options removed only for standalone questions; selected 3-10-letter answers, normalised whitespace, uppercased answers, removed duplicates and close lexical variants.

1 Crossword originals: Original opening questions by 1 Crossword

Licence: CC-BY-SA-4.0 (https://creativecommons.org/licenses/by-sa/4.0/)

Changes: Crossword placement.