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 _    _      ___      ______    ______  __    __  
| || | ||   / _ \\   /_   _//  /_   _// \ \\ / // 
| || | ||  / //\ \\    | ||     -| ||-   \ \/ //  
| \\_/ || |  ___  ||  _| ||     _| ||_    \  //   
 \____//  |_||  |_|| /__//     /_____//    \//    
  `---`   `-`   `-`  `--`      `-----`      `

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Text this: Symbolic message sequence charts