CHEN, Circuit Judge.
Synopsys, Inc. appeals the District Court for the Northern District of California's grant of summary judgment invalidating certain claims of U.S. Patent Nos. 5,530,841; 5,680,318; and 5,748,488 (collectively, the Gregory Patents) under 35 U.S.C. § 101. See Synopsys, Inc. v. Mentor Graphics Corp.,
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