anchor.diff:    };
   
     setupCurrentFilenameTab('cyber-dojo.sh');
  -  setupStdoutTab()
  -  setupStderrTab()
  +  setupOutputTab('stdout')
  +  setupOutputTab('stderr')
     setupReplTab()
   
   });
  
positive.code:        text:filename
      });
      $tabFilenames.append($tab);
      setupTabFilenameClickHandler($tab);
    };
  
    const setupStdoutTab = () => {
      const $tab = $('<div>', {
          class: 'tab-filename',
           text: 'stdout'
      });
      $tabFilenames.append($tab);
      setupTabFilenameClickHandler($tab);
    };
  
    const setupStderrTab = () => {
      const $tab = $('<div>', {
          class: 'tab-filename',
           text: 'stderr'
      });
      $tabFilenames.append($tab);
      setupTabFilenameClickHandler($tab);
    };
  
    const setupReplTab = () => {
      const $tab = $('<div>', {
  
negative.code:     });
      $tabFilenames.append($tab);
      setupReplTabClickHandler($tab);
    };
  
    const setupReplTabClickHandler = (div) => {
  