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 3 Conventions used in this Manual
 *********************************
 
    We use some conventions in this manual.
 
    * For some procedures, notably type predicates, we use "iff" to mean
      `if and only if'.  The construct is usually something like:
      `Return VAL iff CONDITION', where VAL is usually ``#t'' or
      `non-`#f''.  This typically means that VAL is returned if
      CONDITION holds, and that `#f' is returned otherwise.  
 
    * In examples and procedure descriptions and all other places where
      the evaluation of Scheme expression is shown, we use some notation
      for denoting the output and evaluation results of expressions.
 
      The symbol `=>' is used to tell which value is returned by an
      evaluation:
 
           (+ 1 2)
           =>
           3
 
      Some procedures produce some output besides returning a value.
      This is denoted by the symbol `-|'.
 
           (begin (display 1) (newline) 'hooray)
           -| 1
           =>
           hooray
 
 
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