title: Last last command shortcut in Emacs
body: <p>Is there a shortcut (key combination) in <code>emacs</code> to repeat the second last command? Or
  third last command and so on? I know that <kbd>Ctrl</kbd> + <kbd>x</kbd> + <kbd> z </kbd> 
  can be used to invoke the last command, but could not find a key combination for others! </p>