origin classifications. See Soberal-Peres v. Heckler, 717 F.2d 36, 41 (2d Cir.1983), art. denied, — U.S —, 104 S.Ct. 1713, 80 L.Ed.2d 186 (1984); Frontera v Sindell, 522 F.2d 1215, 1219-20 (6th Cir.1975); see also Garcia v. Gloor, 618 F.2d 264, 268 (5th Cir.1980) ("Neither [Title VII] nor com- mon understandin