different between cddr vs cadr

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.

cadr (plural cadrs)

(programming) Car of the cdr in LISP. The second 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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