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diff --git a/dviware/umddvi/dev/interpress.h b/dviware/umddvi/dev/interpress.h
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+/*
+ * Copyright (c) 1987 University of Maryland Department of Computer Science.
+ * All rights reserved. Permission to copy for any purpose is hereby granted
+ * so long as this copyright notice remains intact.
+ */
+
+/* you are assumed to have read the Xerox Interpress documents... I am
+ not going to attempt to explain what these mean. */
+
+/* sequences */
+#define SeqString 1
+#define SeqInteger 2
+#define SeqRational 4
+#define SeqIdentifier 5
+#define SeqComment 6
+#define SeqContinued 7
+#define SeqLargeVec 8
+#define SeqPackedPixVec 9
+#define SeqComprPixVec 10
+#define SeqAdapPixVec 12
+
+/* operators */
+
+/* pseudo ops */
+#define IPBegin 102
+#define IPEnd 103
+#define IPPageInstr 105
+#define IPLB 106 /* { */
+#define IPRB 107 /* } */