The following excerpt is from U.S. v. Boyland, 17 F.3d 396 (9th Cir. 1994):
Federal Rule of Criminal Procedure 52(b) "defines a single category of forfeited-but-reversible error," giving appellate courts the discretion to correct plain error even though a party has failed to preserve the error below. United States v. Olano, 113 S.Ct. 1770, 1777 (1993).
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