module main {
    // Define the shared variable
    var x : integer;

    // Define a counter for each process to track iterations
    var count1, count2, count3 : integer;

    // Initialize the shared variable and counters
    init {
        x = 0;
        count1 = 0;
        count2 = 0;
        count3 = 0;
    }

    // Define the transition relation for each process
    next {
        if (count1 < 10) {
            x' = x + 1;
            count1' = count1 + 1;
        } else if (count2 < 10) {
            x' = x + 1;
            count2' = count2 + 1;
        } else if (count3 < 10) {
            x' = x + 1;
            count3' = count3 + 1;
        } else {
            x' = x;
            count1' = count1;
            count2' = count2;
            count3' = count3;
        }
    }

    // Define the property to check if x can be 2
    invariant check_x_equals_2 : (x == 2);

    // Control block to perform bounded model checking
    control {
        // Unroll the transition system up to 30 steps (10 steps per process)
        var v : verification = unroll(30);
        check;
        print_results;
        v.print_cex();
    }
}
