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(readline.info.gz) Numeric Arguments

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 1.4.5 Specifying Numeric Arguments
 ----------------------------------
 
 `digit-argument (M-0, M-1, ... M--)'
      Add this digit to the argument already accumulating, or start a new
      argument.  `M--' starts a negative argument.
 
 `universal-argument ()'
      This is another way to specify an argument.  If this command is
      followed by one or more digits, optionally with a leading minus
      sign, those digits define the argument.  If the command is
      followed by digits, executing `universal-argument' again ends the
      numeric argument, but is otherwise ignored.  As a special case, if
      this command is immediately followed by a character that is
      neither a digit or minus sign, the argument count for the next
      command is multiplied by four.  The argument count is initially
      one, so executing this function the first time makes the argument
      count four, a second time makes the argument count sixteen, and so
      on.  By default, this is not bound to a key.
 
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