Even a slight change in the timing of this traffic light would cause a traffic backup  On the one hand, if the timing were slower, traffic would back up waiting for the light to turn green  On the other hand, if the timing were faster, traffic would back up because too few cars would get through each green light
Ttherefore, this traffic light was timed to keep traffic from backing up
Even a slight change in this spaghetti sauce recipe will result in an unhealthful sauce. On the one hand, if too many tomatoes are used, the sauce will be too acidic; on the other hand, if too few tomatoes are used, the sauce will not have enough vitamin C. Ttherefore, this recipe is designed to produce healthful spaghetti sauce.