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diff --git a/sys/vops/lz/alani.x b/sys/vops/lz/alani.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ALAN -- Compute the logical AND of two vectors (generic).  The logical
+# output value is returned as an int.
+
+procedure alani (a, b, c, npix)
+
+int	a[ARB], b[ARB]
+int	c[ARB]
+
+int	npix, i
+
+begin
+	do i = 1, npix
+	    if (a[i] != 0 && b[i] != 0)
+		c[i] = YES
+	    else
+		c[i] = NO
+end