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diff --git a/cpp/demo/book/map_filesystem/Grammar.h b/cpp/demo/book/map_filesystem/Grammar.h
new file mode 100644
index 00000000000..b5b8e41ade4
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+++ b/cpp/demo/book/map_filesystem/Grammar.h
@@ -0,0 +1,81 @@
+/* A Bison parser, made by GNU Bison 2.3.  */
+
+/* Skeleton interface for Bison's Yacc-like parsers in C
+
+   Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+   Free Software Foundation, Inc.
+
+   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 2, 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, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+/* As a special exception, you may create a larger work that contains
+   part or all of the Bison parser skeleton and distribute that work
+   under terms of your choice, so long as that work isn't itself a
+   parser generator using the skeleton or a modified version thereof
+   as a parser skeleton.  Alternatively, if you modify or redistribute
+   the parser skeleton itself, you may (at your option) remove this
+   special exception, which will cause the skeleton and the resulting
+   Bison output files to be licensed under the GNU General Public
+   License without this special exception.
+
+   This special exception was added by the Free Software Foundation in
+   version 2.2 of Bison.  */
+
+/* Tokens.  */
+#ifndef YYTOKENTYPE
+# define YYTOKENTYPE
+   /* Put the tokens into the symbol table, so that GDB and other debuggers
+      know about them.  */
+   enum yytokentype {
+     TOK_HELP = 258,
+     TOK_EXIT = 259,
+     TOK_STRING = 260,
+     TOK_LIST = 261,
+     TOK_LIST_RECURSIVE = 262,
+     TOK_CREATE_FILE = 263,
+     TOK_CREATE_DIR = 264,
+     TOK_PWD = 265,
+     TOK_CD = 266,
+     TOK_CAT = 267,
+     TOK_WRITE = 268,
+     TOK_RM = 269
+   };
+#endif
+/* Tokens.  */
+#define TOK_HELP 258
+#define TOK_EXIT 259
+#define TOK_STRING 260
+#define TOK_LIST 261
+#define TOK_LIST_RECURSIVE 262
+#define TOK_CREATE_FILE 263
+#define TOK_CREATE_DIR 264
+#define TOK_PWD 265
+#define TOK_CD 266
+#define TOK_CAT 267
+#define TOK_WRITE 268
+#define TOK_RM 269
+
+
+
+
+#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
+typedef int YYSTYPE;
+# define yystype YYSTYPE /* obsolescent; will be withdrawn */
+# define YYSTYPE_IS_DECLARED 1
+# define YYSTYPE_IS_TRIVIAL 1
+#endif
+
+
+