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diff --git a/lib/unicase/special-casing.in.h b/lib/unicase/special-casing.in.h
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+++ b/lib/unicase/special-casing.in.h
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+/* Special casing table.
+   Copyright (C) 2009-2018 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+   This program is free software: you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <stddef.h>
+
+/* A special casing context.
+   A context is negated through x -> -x.  */
+enum
+{
+  SCC_ALWAYS             = 0,
+  SCC_FINAL_SIGMA        = 1,
+  SCC_AFTER_SOFT_DOTTED  = 2,
+  SCC_MORE_ABOVE         = 3,
+  SCC_BEFORE_DOT         = 4,
+  SCC_AFTER_I            = 5
+};
+
+struct special_casing_rule
+{
+  /* The first two bytes are the code, in big-endian order.  The third byte
+     only distinguishes different rules pertaining to the same code.  */
+  /*unsigned*/ char code[3];
+
+  /* True when this rule is not the last one for the given code.  */
+  /*bool*/ unsigned int has_next : 1;
+
+  /* Context.  */
+  signed int context : 7;
+
+  /* Language, or an empty string.  */
+  char language[2];
+
+  /* Mapping to upper case.  Between 0 and 3 characters.  Filled with 0s.  */
+  unsigned short upper[3];
+
+  /* Mapping to lower case.  Between 0 and 3 characters.  Filled with 0s.  */
+  unsigned short lower[3];
+
+  /* Mapping to title case.  Between 0 and 3 characters.  Filled with 0s.  */
+  unsigned short title[3];
+
+  /* Casefolding mapping.  Between 0 and 3 characters.  Filled with 0s.  */
+  unsigned short casefold[3];
+};
+
+extern const struct special_casing_rule *
+       gl_unicase_special_lookup (const char *str, size_t len);