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A 1 inch rise over 100 inches is 1 percent.
 
A 1 inch rise over 50 inches is 2 percent.
 
A 1 inch rise over 25 inches is 4 percent.
A 3/4 inch rise over 25 inches is 3 percent.
A 1/2 inch rise over 25 inches is 2 percent.
A 1/4 inch rise over 25 inches is 1 percent.
 
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