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R> Read Mode

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PREVIOUS  -  display the previous message

Usage:  PREVIOUS

The PREVIOUS command makes the message before the current message be 
  current, and displays it.  The current message is the one you just read; 
  PREVIOUS shows you the one before that.  To display the current message
  again, use the TYPE command.

For more help type "help" and one of these topics:
  next   type   other
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