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6.1.2.7 Examples of for-as-on-list subclause
     ;; Collect successive tails of a list.
      (loop for sublist on '(a b c d)
            collect sublist)
     =>  ((A B C D) (B C D) (C D) (D))
     
     ;; Print a list by using destructuring with the loop keyword ON.
      (loop for (item) on '(1 2 3)
            do (print item))
      |>  1
      |>  2
      |>  3
     =>  NIL