module main {
    // Variables for Circuit C1
    var y1 : boolean;
    var r1 : boolean;

    // Variables for Circuit C2
    input x2 : boolean;
    var y2 : boolean;
    var r2 : boolean;

    // Initialize the registers and outputs
    init {
        y1 = false;
        r1 = false;
        y2 = false;
        r2 = false;
    }

    // Define the transitions based on control functions
    next {
        y1' = r1;
        r1' = !r1;
        y2' = x2' | r2; // Note: x2' is used to denote the next value of x2, assuming external control
        r2' = x2' | r2;
    }

    // Example property (optional): Check if the output y2 eventually follows x2 when x2 is stable
    property prop_follow_x2: G (x2 = x2' -> F y2 = x2);
}
