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- 16:41: Wikipedia screenshot (CC-BY-SA-4.0 Wikipedia.org)
- 19:33: Screenshots of papers Yang, Desiderio-Sloane and Meadors (CC-BY-4.0 The Authors), Mishra, Barnes, Tabarez and Mate (Preprint CC-BY-4.0 The Authors), Cole, Fredrick, Parts, Kingston, Chinatti, Tusler, Mahadevan, Terrien and Diddams (CC-BY-4.0 The Authors)
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