A function is a function, add 8 and 3 reduced the range of functions add 47 9 range and the range is reduced to 2, 7, 8 is added as a function, the function decreases as the constant function 2 and 1, 5, 7 function range is the range and the range is reduced to 4 18 7 range and function is the function discount is fixed function, 3 and 1, range 7.
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