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license this software and its documentation for any purpose, provided that
existing copyright notices are retained in all copies and that this notice
is included verbatim in any distributions. No written agreement, license,
or royalty fee is required for any of the authorized uses. Modifications to
this software may be copyrighted by their authors and need not follow the
licensing terms described here, provided that the new terms are clearly indicated
on the first page of each file where they apply.
