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diff --git a/lib/et/error_table.h b/lib/et/error_table.h
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+/*
+ * Copyright 1988 by the Student Information Processing Board of the
+ * Massachusetts Institute of Technology.
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose is hereby granted, provided that
+ * the names of M.I.T. and the M.I.T. S.I.P.B. not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission. M.I.T. and the
+ * M.I.T. S.I.P.B. make no representations about the suitability of
+ * this software for any purpose. It is provided "as is" without
+ * express or implied warranty.
+ */
+
+#ifndef _ET_H
+
+struct et_list {
+ struct et_list *next;
+ const struct error_table *table;
+};
+extern struct et_list *_et_list, *_et_dynamic_list;
+
+#define ERRCODE_RANGE 8 /* # of bits to shift table number */
+#define BITS_PER_CHAR 6 /* # bits to shift per character in name */
+
+extern const char *error_table_name(errcode_t num);
+
+#define _ET_H
+#endif