0 -> x_0 x_0 -> 0 x_0 -> y_0 x_0 -> L_0 y_0 -> 0 y_0 -> y_1 L_0 -> y_0 y_0 -> 0 y_1 -> 0 y_1 -> 0 L_0 -> 0 0 -> v_0 v_0 -> 0 0 -> z_a 0 -> z_a z_a -> 0 m_0_0 -> 2*m_1_0 m_1_0 -> 2*m_2_0 m_2_0 -> 2*m_3_0 m_3_0 -> 2*m_4_0 m_4_0 -> 2*m_5_0 m_5_0 -> 2*m_6_0 m_6_0 -> 2*m_7_0 m_7_0 -> 2*m_8_0 m_8_0 -> 0