Common Corpus: The Largest Collection of Ethical Data for LLM Pre-Training - Langlais, Pierre-Carl; Chizhov, Pavel; Arnett, Catherine; Hinostroza, Carlos; Nee, Mattia; Jones, Eliot; Girard, Irène; Mach, David; Stasenko, Anastasia; Yamshchikov, Ivan (International Conference on Learning Representations, 2026)