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        Summary 
        
         
          
           | Description | 
           Illustration that  concatenation is  noncommutative. | 
          
          
           | Date | 
           22:40, 11 February 2008 (UTC) | 
          
          
           | Source | 
           Own work, made with  Inkscape and hand edited. | 
          
          
           | Author | 
            Weston.pace and  Sarregouset. | 
          
         
         
        
         
          
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             Permission is granted to copy, distribute and/or modify this document under the terms of the  GNU Free Documentation License, Version 1.2 or any later version published by the  Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled  GNU Free Documentation License.  http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue 
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           I,  Sarregouset, the copyright holder of this work, hereby publishes it under the following licenses:
           
            
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             Permission is granted to copy, distribute and/or modify this document under the terms of the  GNU Free Documentation License, Version 1.2 or any later version published by the  Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled  GNU Free Documentation License.  http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue 
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