Where were the repair ingredients for Defects4j bugs? - Yang, Deheng; Liu, Kui; Kim, Dongsun; Koyuncu, Anil; Kim, Kisub; Tian, Haoye; Lei, Yan; Mao, Xiaoguang; Klein, Jacques; Bissyandé, Tegawendé F. (Empirical Software Engineering, 2021)