The following excerpt is from Yanny v. Church of Scientology Intern., 933 F.2d 1018 (9th Cir. 1991):
Whether the claims asserted in a federal complaint should have been brought as a compulsory counterclaim in an earlier state court action is a question of state law. Pochiro v. Prudential Ins. Co. of Am., 827 F.2d 1246, 1249 (9th Cir.1987). We review de novo district court rulings on questions of state law. Id.
Cal.Code Civ.Pro. Sec. 426.30(a) states:
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