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diff --git a/sys/vops/ak/aands.x b/sys/vops/ak/aands.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# AAND -- Compute the bitwise boolean 'and' of two vectors (generic).
+
+procedure aands (a, b, c, npix)
+
+short	a[ARB], b[ARB], c[ARB]
+int	npix, i
+short	ands()
+
+begin
+	do i = 1, npix {
+		c[i] = ands (a[i], b[i])
+	}
+end