(lispref.info)Modifying Lists

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Modifying Existing List Structure

   You can modify the CAR and CDR contents of a cons cell with the
primitives `setcar' and `setcdr'.

     Common Lisp note: Common Lisp uses functions `rplaca' and `rplacd'
     to alter list structure; they change structure the same way as
     `setcar' and `setcdr', but the Common Lisp functions return the
     cons cell while `setcar' and `setcdr' return the new CAR or CDR.

* Setcar
Replacing an element in a list.
* Setcdr
Replacing part of the list backbone. This can be used to remove or add elements.
* Rearrangement
Reordering the elements in a list; combining lists.

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