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f:(-3) = (-3) + 4 = 1
f:(-2) = (-2) + 4 = 2
f: (-1) = (-1) + 4 = 3
f:0 = 0 + 4 = 4
kodomain = bilangan cacah = {0,1,2,3,4,......}
range = {1,2,3,4}