Description of the illustration addci021.gif

The image is a 10 by 10 grid that shows overlapping service areas of three stations:

• Station 1 covers these cells: 25, 26, 27, 28, 35, 36, 37, 38, 45, 46, 47, 48, 55, 56, 57, and 58.

• Station 2 covers these cells: 38, 39, 40, 48, 49, 50, 58, 59, and 60.

• Station 3 covers these cells: 57, 58, 59, 60, 67, 68, 69, 70, 77, 78, 79, 80, 87, 88, 89, and 90.

Cells 38 and 48 are covered by Station 1 and Station 2. Cells 59, 60, 68, 69, and 70 are covered by Station 2 and Station 3. Cell 57 is covered by Station 1 and Station 3. Cell 58 is covered by all three stations.