While conducting an experiment, a student determines the gravitational force between two objects of equal mass. He uses this as his control for the experiment. He then conducts five additional experiments. He performs the experiments with the changes listed, measuring the effect of each on the gravitational force between the objects and comparing the results to the information from the control. Experiment 1: Replace one control object with an object that is double the mass of the objects in the control at the control distance. Experiment 2: Replace both control objects with objects that are double the mass of the objects in the control at the control distance. Experiment 3: Using the control objects, double the distance between the objects compared to the control. Experiment 4: Using the control objects, reduce the distance between the objects compared to the control. Experiment 5: Replace one control object with an object that is half the mass of the objects in the control at the control distance. Which pair of experiments both resulted in a decrease in the gravitational force between the two objects compared to the control?