b = false;
x = 1;
y = 1;
----------
b = false;
x = 2;
y = 2;
----------
b = false;
x = 3;
y = 3;
----------
b = true;
x = 1;
y = 2;
----------
b = true;
x = 1;
y = 3;
----------
b = true;
x = 2;
y = 1;
----------
b = true;
x = 2;
y = 3;
----------
b = true;
x = 3;
y = 1;
----------
b = true;
x = 3;
y = 2;
----------
==========