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

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