GNU GENERAL PUBLIC LICENSE
                        Version 2, June 1991
 
 Copyright (C) 1989, 1991 Free Software Foundation, Inc.  
 
 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.
 
                          Preamble
 
  The licenses for most software are designed to take away your 
 freedom to share and change it. By contrast, the GNU General Public 
 License is intended to guarantee your freedom to share and change free 
 software--to make sure the software is free for all its users. This 
 General Public License applies to most of the Free Software 
 Foundation's software and to any other program whose authors commit to 
 using it. (Some other Free Software Foundation software is covered by 
 the GNU Lesser General Public License instead.) You can apply it to 
 your programs, too.
 
  When we speak of free software, we are referring to freedom, not
 price. Our General Public Licenses are designed to make sure that you 
 have the freedom to distribute copies of free software (and charge for 
 this service if you wish), that you receive source code or can get it 
 if you want it, that you can change the software or use pieces of it 
 in new free programs; and that you know you can do these things.
 
  To protect your rights, we need to make restrictions that forbid 
 anyone to deny you these rights or to ask you to surrender the rights. 
 These restrictions translate to certain responsibilities for you if you 
 distribute copies of the software, or if you modify it.
 
  For example, if you distribute copies of such a program, whether 
 gratis or for a fee, you must give the recipients all the rights that 
 you have. You must make sure that they, too, receive or can get the 
 source code. And you must show them these terms so they know their 
 rights.
 
  We protect your rights with two steps: (1) copyright the software, and 
 (2) offer you this license which gives you legal permission to copy, 
 distribute and/or modify the software.
 
  Also, for each author's protection and ours, we want to make certain 
 that everyone understands that there is no warranty for this free 
 software. If the software is modified by someone else and passed on, we 
 want its recipients to know that what they have is not the original, so 
 that any problems introduced by others will not reflect on the original 
 authors' reputations.
 
  Finally, any free program is threatened constantly by software 
 patents. We wish to avoid the danger that redistributors of a free 
 program will individually obtain patent licenses, in effect making the 
 program proprietary. To prevent this, we have made it clear that any 
 patent must be licensed for everyone's free use or not licensed at all.
 
  The precise terms and conditions for copying, distribution and 
 modification follow.
 
                       GNU GENERAL PUBLIC LICENSE
    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 
 
  0. This License applies to any program or other work which contains 
 a notice placed by the copyright holder saying it may be distributed 
 under the terms of this General Public License. The "Program", below, 
 refers to any such program or work, and a "work based on the Program" 
 means either the Program or any derivative work under copyright law: 
 that is to say, a work containing the Program or a portion of it, 
 either verbatim or with modifications and/or translated into another 
 language. (Hereinafter, translation is included without limitation in 
 the term "modification".) Each licensee is addressed as "you".
 
 Activities other than copying, distribution and modification are not 
 covered by this License; they are outside its scope. The act of 
 running the Program is not restricted, and the output from the Program 
 is covered only if its contents constitute a work based on the 
 Program (independent of having been made by running the Program). 
 Whether that is true depends on what the Program does.
 
  1. You may copy and distribute verbatim copies of the Program's 
 source code as you receive it, in any medium, provided that you 
 conspicuously and appropriately publish on each copy an appropriate 
 copyright notice and disclaimer of warranty; keep intact all the 
 notices that refer to this License and to the absence of any warranty; 
 and give any other recipients of the Program a copy of this License 
 along with the Program.
 
 You may charge a fee for the physical act of transferring a copy, and 
 you may at your option offer warranty protection in exchange for a fee.
 
  2. You may modify your copy or copies of the Program or any portion 
 of it, thus forming a work based on the Program, and copy and 
 distribute such modifications or work under the terms of Section 1 
 above, provided that you also meet all of these conditions:
 
    a) You must cause the modified files to carry prominent notices 
    stating that you changed the files and the date of any change.
 
    b) You must cause any work that you distribute or publish, that in 
    whole or in part contains or is derived from the Program or any 
    part thereof, to be licensed as a whole at no charge to all third 
    parties under the terms of this License.
 
    c) If the modified program normally reads commands interactively 
    when run, you must cause it, when started running for such 
    interactive use in the most ordinary way, to print or display an 
    announcement including an appropriate copyright notice and a 
    notice that there is no warranty (or else, saying that you provide 
    a warranty) and that users may redistribute the program under 
    these conditions, and telling the user how to view a copy of this 
    License. (Exception: if the Program itself is interactive but 
    does not normally print such an announcement, your work based on 
    the Program is not required to print an announcement.)
 
 These requirements apply to the modified work as a whole. If 
 identifiable sections of that work are not derived from the Program, 
 and can be reasonably considered independent and separate works in 
 themselves, then this License, and its terms, do not apply to those 
 sections when you distribute them as separate works. But when you 
 distribute the same sections as part of a whole which is a work based 
 on the Program, the distribution of the whole must be on the terms of 
 this License, whose permissions for other licensees extend to the entire 
 whole, and thus to each and every part regardless of who wrote it.
 
 Thus, it is not the intent of this section to claim rights or contest 
 your rights to work written entirely by you; rather, the intent is to 
 exercise the right to control the distribution of derivative or 
 collective works based on the Program.
 
 In addition, mere aggregation of another work not based on the Program 
 with the Program (or with a work based on the Program) on a volume of 
 a storage or distribution medium does not bring the other work under 
 the scope of this License.
 
  3. You may copy and distribute the Program (or a work based on it, 
 under Section 2) in object code or executable form under the terms of 
 Sections 1 and 2 above provided that you also do one of the following:
 
    a) Accompany it with the complete corresponding machine-readable 
    source code, which must be distributed under the terms of Sections 
    1 and 2 above on a medium customarily used for software interchange; or,
 
    b) Accompany it with a written offer, valid for at least three years, 
    to give any third party, for a charge no more than your cost of 
    physically performing source distribution, a complete machine-readable 
    copy of the corresponding source code, to be distributed under the terms 
    of Sections 1 and 2 above on a medium customarily used for software 
    interchange; or,
 
    c) Accompany it with the information you received as to the offer 
    to distribute corresponding source code. (This alternative is allowed 
    only for noncommercial distribution and only if you received the program 
    in object code or executable form with such an offer, in accord with 
    Subsection b above.)
 
 The source code for a work means the preferred form of the work for 
 making modifications to it. For an executable work, complete source 
 code means all the source code for all modules it contains, plus any 
 associated interface definition files, plus the scripts used to 
 control compilation and installation of the executable. However, as a 
 special exception, the source code distributed need not include 
 anything that is normally distributed (in either source or binary 
 form) with the major components (compiler, kernel, and so on) of the 
 operating system on which the executable runs, unless that component 
 itself accompanies the executable.
 
 If distribution of executable or object code is made by offering 
 access to copy from a designated place, then offering equivalent 
 access to copy the source code from the same place counts as 
 distribution of the source code, even though third parties are not 
 compelled to copy the source along with the object code.
 
  4. You may not copy, modify, sublicense, or distribute the Program 
 except as expressly provided under this License. Any attempt 
 otherwise to copy, modify, sublicense or distribute the Program is 
 void, and will automatically terminate your rights under this License. 
 However, parties who have received copies, or rights, from you under 
 this License will not have their licenses terminated so long as such 
 parties remain in full compliance.
 
  5. You are not required to accept this License, since you have not 
 signed it. However, nothing else grants you permission to modify or 
 distribute the Program or its derivative works. These actions are 
 prohibited by law if you do not accept this License. Therefore, by 
 modifying or distributing the Program (or any work based on the 
 Program), you indicate your acceptance of this License to do so, and 
 all its terms and conditions for copying, distributing or modifying 
 the Program or works based on it.
 
  6. Each time you redistribute the Program (or any work based on the 
 Program), the recipient automatically receives a license from the 
 original licensor to copy, distribute or modify the Program subject to 
 these terms and conditions. You may not impose any further 
 restrictions on the recipients' exercise of the rights granted herein. 
 You are not responsible for enforcing compliance by third parties to 
 this License.
 
  7. If, as a consequence of a court judgment or allegation of patent 
 infringement or for any other reason (not limited to patent issues), 
 conditions are imposed on you (whether by court order, agreement or 
 otherwise) that contradict the conditions of this License, they do not 
 excuse you from the conditions of this License. If you cannot 
 distribute so as to satisfy simultaneously your obligations under this 
 License and any other pertinent obligations, then as a consequence you 
 may not distribute the Program at all. For example, if a patent license
 would not permit royalty-free redistribution of the Program by all those
 who receive copies directly or indirectly through you, then the only way
 you could satisfy both it and this License would be to refrain entirely
 from distribution of the Program.
 
 If any portion of this section is held invalid or unenforceable under 
 any particular circumstance, the balance of the section is intended to 
 apply and the section as a whole is intended to apply in other 
 circumstances.
 
 It is not the purpose of this section to induce you to infringe any 
 patents or other property right claims or to contest validity of any 
 such claims; this section has the sole purpose of protecting the 
 integrity of the free software distribution system, which is implemented 
 by public license practices. Many people have made generous contributions 
 to the wide range of software distributed through that system in reliance 
 on consistent application of that system; it is up to the author/donor to 
 decide if he or she is willing to distribute software through any other 
 system and a licensee cannot impose that choice.
 
 This section is intended to make thoroughly clear what is believed to be 
 a consequence of the rest of this License.
 
 
  8. If the distribution and/or use of the Program is restricted in 
 certain countries either by patents or by copyrighted interfaces, the 
 original copyright holder who places the Program under this License 
 may add an explicit geographical distribution limitation excluding 
 those countries, so that distribution is permitted only in or among 
 countries not thus excluded. In such case, this License incorporates 
 the limitation as if written in the body of this License.
 
  9. The Free Software Foundation may publish revised and/or new versions 
 of the General Public License from time to time. Such new versions will 
 be similar in spirit to the present version, but may differ in detail to 
 address new problems or concerns.
 
 Each version is given a distinguishing version number. If the Program 
 specifies a version number of this License which applies to it and "any 
 later version", you have the option of following the terms and conditions 
 either of that version or of any later version published by the Free 
 Software Foundation. If the Program does not specify a version number of 
 this License, you may choose any version ever published by the Free Software 
 Foundation.
 
  10. If you wish to incorporate parts of the Program into other free 
 programs whose distribution conditions are different, 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.
 
                                  NO WARRANTY
 
  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 
 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 
 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 
 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 
 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 
 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 
 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 
 REPAIR OR CORRECTION.
 
  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 
 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 
 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 
 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 
 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 
 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 
 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 
 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 
 POSSIBILITY OF SUCH DAMAGES.
 
                          END OF TERMS AND CONDITIONS
 
 How to Apply These Terms to Your New Programs
 
  If you develop a new program, and you want it to be of the greatest 
 possible use to the public, the best way to achieve this is to make 
 it free software which everyone can redistribute and change under 
 these terms.
 
  To do so, attach the following notices to the program. It is safest 
 to attach them to the start of each source file to most effectively 
 convey the exclusion of warranty; and each file should have at least 
 the "copyright" line and a pointer to where the full notice is found.
 
    <one line to give the program's name and an idea of what it does.>
    Copyright (C) yyyy  name of author
 
    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
    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, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  
    02110-1301, USA.
 
 Also add information on how to contact you by electronic and paper mail.
 
 If the program is interactive, make it output a short notice like this 
 when it starts in an interactive mode:
 
    Gnomovision version 69, Copyright (C) year name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
    type `show w'.  This is free software, and you are welcome
    to redistribute it under certain conditions; type `show c' 
    for details.
 
 The hypothetical commands `show w' and `show c' should show the appropriate 
 parts of the General Public License. Of course, the commands you use may 
 be called something other than `show w' and `show c'; they could even be 
 mouse-clicks or menu items--whatever suits your program.
 
 You should also get your employer (if you work as a programmer) or your 
 school, if any, to sign a "copyright disclaimer" for the program, if 
 necessary. Here is a sample; alter the names:
 
    Yoyodyne, Inc., hereby disclaims all copyright interest in the program 
    `Gnomovision' (which makes passes at compilers) written  by James Hacker.
 
    <signature of Ty Coon>, 1 April 1989
    Ty Coon, President of Vice
 
 This General Public License does not permit incorporating your program into
 proprietary programs. If your program is a subroutine library, you may 
 consider it more useful to permit linking proprietary applications with the 
 library. If this is what you want to do, use the GNU Lesser General 
 Public License instead of this License.
 
 

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