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Exercise 5.19

Write a procedure that determines if a function f is increasing on the integer range from low to high: 
     f(low) < f(low+1) < ... < f(high)
Example function: f(x) = x2 - 2x:

Desired behavior: 

     (increasing-on-integer-range? f 0 4) → #f

     (increasing-on-integer-range? f 1 4) → #t
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