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## 6.1.2.1.1.1 Examples of for-as-arithmetic subclause

    ;; Print some numbers.
     (loop for i from 1 to 3
           do (print i))
    >>  1
    >>  2
    >>  3
    =>  NIL

    ;; Print every third number.
     (loop for i from 10 downto 1 by 3
           do (print i))
    >>  10
    >>  7
    >>  4
    >>  1
    =>  NIL

    ;; Step incrementally from the default starting value.
     (loop for i below 3
           do (print i))
    >>  0
    >>  1
    >>  2
    =>  NIL

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