“…As can be seen from Fig.5, six distribution centers (25,18,13,5,12,9) are selected in the 30 customers location with the weight by demand, the 25-th distribution center can supply the demand for six customers (1,2,16,19,23,26), the 18-th distribution center can supply the demand for two customers (28,29), the 13-th distribution center can supply the demand for six customers (6,15,14,18,27,30), the 5-th distribution center can supply the demand for six customers (7,21), the 12-th distribution center can supply the demand for six customers (3,4,8,11,17,24), and the 9-th distribution center can supply the demand for two customers (10,22).…”