void main() {
    int a = 3;
    int b = 4;
    int c = 2 + 4;
    int d = c + 0;
    c = 1 + 4;
    {
        int a = 5;
        int b = 6;
        print a;
        print b;
    }
    {
        int c = 7;
        print c;
        print d;
    }
    print a;
    print b + 10;
    print c;
    print d;
}