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 ANSI Common Lisp    14 Conses    14.2 Dictionary of Conses
 
 - Class Precedence List:
 - 
null,
symbol,
list,
sequence,
t
  - Description:
 - 
The only object of type null is nil, 
which represents the empty list and can also be notated ().
  - See Also:
 - 
Section 2.3.4 Symbols as Tokens,
Section 2.4.1 Left-Parenthesis,
Section 22.1.3.3 Printing Symbols
  - Allegro CL Implementation Details:
 - 
 None.
  
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