Append

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Appending lists in a solution:

(mod (list1 list2)
(defun append (list1 list2)
  (if (l list1)
     (c (f list1) (append (r list1) list2))
     list2) 
  )
(append list1 list2)
)

Example Usage:

brun '(a (q 2 2 (c 2 (c 5 (c 11 ())))) (c (q 2 (i (l 5) (q 4 9 (a 2 (c 2 (c 13 (c 11 ()))))) (q . 11)) 1) 1))' '((99 33)(1 2 3))'

Outputs:

(99 33 1 2 3)