$$P_{0,0}$$

$$P_{0,1}$$

$$P_{0,3}$$

$$P_{2,0}$$

$$P_{2,2}$$

$$P_{2,3}$$

$$S(u_0,v_0)$$

$$ С_{u_0}(v) $$

$$ Q_0(u_0) $$

$$ Q_1(u_0) $$

$$ Q_2(u_0) $$

$$ Q_3(u_0) $$