STORES Table                                 1
                             Coordinates of Stores

                          Store            x         y
                          ----------------------------
                          store1           6         1
                          store2           5         2
                          store3           3         5
                          store4           7         5
                                  HOUSES Table                                 2
                             Coordinates of Houses

                          House            x         y
                          ----------------------------
                          house1           1         1
                          house2           3         3
                          house3           2         3
                          house4           7         7