55:  How do I insert `>' at the beginning of every line?
  
  Type "M-x replace-regexp RET ^ RET > RET".
  
  To do this only in the region, type "C-x n M-x replace-regexp RET ^ RET
  > RET C-x w".
  
  WARNING: The command narrow-to-region (C-x n) is disabled by default
  because it can be very confusing (ie., "Oh no!  Where did my file go?").