In this procedure you will utilize case statements to select between various possible states of operation.

Create a structured text program which produces the following response. You must use a CASE statement in your program.

The program will cycle through all five stack lights.

On start the bottom light will be active.

If a red button is pressed the program will move the active light up by $1$ in the stack light column $($transitioning from top to bottom as needed$).$

If the green button is pressed the program will move the active light down by $1$ in the stack light column $($transitioning from bottom to top as needed$).$

If the yellow bulaton is pressed the program will light all $5$ stack light elements for $1$ second and then return to the original starting state of only illuminating the bottom stack light.