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 How to define new macros
 ************************
 
    Macros can be defined, redefined and deleted in several different
 ways.  Also, it is possible to redefine a macro, without losing a
 previous value, which can be brought back at a later time.
 

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* Define                      Defining a new macro
* Arguments                   Arguments to macros
* Pseudo Arguments            Pseudo arguments to macros
* Undefine                    Deleting a macro
* Defn                        Renaming macros
* Pushdef                     Temporarily redefining macros
 
* Indir                       Indirect call of macros
* Builtin                     Indirect call of builtins
 

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