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 <http://www.gnu.org/licenses/>. 

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.
