We also show the performance of the number of the tasks reaching different degrees of satisfaction against varying operations. Fig. 16(a), Fig. 16(b), and Fig. 16(c) show the curves of our system, Engine A, and Engine B with 1-5 operations. The horizontal axis represents the degree of satisfaction, and the vertical axis represents the number of tasks. Note that the first operation is the result of only using the text queries. We can see that our results from operation 2 to operation 5 are better than the results of A and B.