4-7 Write a documented program for the relay schematic shown. Use the IO Simulator screen and the following addresses to simulate the program: \[ \begin{array}{l} \text { LS1 } \_1: 1 / 0 \\ \text { LS2_I:1/1 } \\ \text { L.S3_- I:1/2 } \\ \text { Horn } 0: 2 / 0 \end{array} \]