CLHS: Section 6.1.3.2

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## 6.1.3.2 Examples of APPEND and NCONC clauses

    ;; Use APPEND to concatenate some sublists.
      (loop for x in '((a) (b) ((c)))
            append x)
    =>  (A B (C))

    ;; NCONC some sublists together.  Note that only lists made by the
    ;; call to LIST are modified.
      (loop for i upfrom 0
            as x in '(a b (c))
            nconc (if (evenp i) (list x) nil))
    =>  (A (C))

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