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Everyone is permitted to copy and distribute verbatim
copies of this license document, but changing it is not
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Preamble
The GNU General Public License is a free, copyleft
license for software and other kinds of works.
The licenses for most software and other practical
works are designed to take away your freedom to share
and change the works. By contrast, the GNU General
Public License is intended to guarantee your freedom
to share and change all versions of a program--to make
sure it remains free software for all its users. We, the
Free Software Foundation, use the GNU General Public
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When we speak of free software, we are referring to
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