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diff --git a/sys/vops/lz/anots.x b/sys/vops/lz/anots.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ANOT -- Compute the bitwise boolean complement of a vector (generic).
+
+procedure anots (a, b, npix)
+
+short	a[ARB], b[ARB]
+int	npix, i
+short	nots()
+
+begin
+	do i = 1, npix {
+		b[i] = nots (a[i])
+	}
+end