User's Manual

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10. If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are dierent, write to
the author to ask for permission.
For software which is copyrighted by the Free Software
Foundation, write to the Free Software Foundation; we
sometimes make exceptions for this. Our decision will be
guided by the two goals of preserving the free status of all
derivatives of our free software and of promoting the sharing
and reuse of software generally.