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Allegro CL
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  ANSI Common Lisp   6 Iteration   6.1 The LOOP Facility   6.1.3 Value Accumulation Clauses

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

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