0 -> x
x -> 0
x -> y_0
x -> L
y_0 -> 0
y_0 -> y_1
L -> y_0
y_0 -> 0
y_1 -> 0
y_1 -> 0
L -> 0
0 -> v
v -> 0
0 -> z_a
0 -> z_a
z_a -> 0
m_0 -> 2*m_1
m_1 -> 2*m_2
m_2 -> 2*m_3
m_3 -> 2*m_4
m_4 -> 2*m_5
m_5 -> 2*m_6
m_6 -> 2*m_7
m_7 -> 2*m_8
m_8 -> 0
0 -> z_i
0 -> z_i
z_i -> 0
y_0 -> 0
y_1 -> 0