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6.1.3.5 Examples of SUM clause
      (loop for i of-type fixnum in '(1 2 3 4 5)
            sum i)
     =>  15
      (setq series '(1.2 4.3 5.7))
     =>  (1.2 4.3 5.7)
      (loop for v in series
            sum (* 2.0 v))
     =>  22.4