400 +-----------------------------------------+---------+

   400 +-----------------------------------------+---------+

   401 | Previous occurrence of ``x`` in the line| ``Fx``  |

   401 | Previous occurrence of ``x`` in the line| ``Fx``  |

   402 +-----------------------------------------+---------+

   402 +-----------------------------------------+---------+

   403 

   403 

   404 +---------------------------------------+------------------+

   404 +---------------------------------------+------------------+

   406 +=======================================+==================+

   406 +=======================================+==================+

   407 | Replace the first instance of ``old`` |``:s/old/new``    |

   407 | Replace the first instance of ``old`` |``:s/old/new``    |

   408 | with ``new`` in the current line.     |                  |

   408 | with ``new`` in the current line.     |                  |

   409 +---------------------------------------+------------------+

   409 +---------------------------------------+------------------+

   410 | Replace all instances of ``old``      |``:s/old/new/g``  |

   410 | Replace all instances of ``old``      |``:s/old/new/g``  |