different between cddr vs caddr

English

Contraction of cdr of the cdr.

cddr (plural cddrs)

(computing) Cdr of the cdr in LISP. The rest of a list if the first two elements are removed.

Contraction of car of the cdr of the cdr.

caddr (plural caddrs)

(programming) Car of the cdr of the cdr in LISP. The third element in a list.
- 2000, Matt Kaufmann, Panagiotis Manolios, and J Strother Moore, Computer-aided reasoning: an approach
  If we let x denote the tree (1 2 3), then the car of x is 1, the cdr of x is (2 3), the cadr of x is 2, the caddr of x is 3, and the cdddr of x is nil.

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