x1 = x
x2 = y_0
x3 = y_1
x4 = L
x5 = v
x6 = z_a
x7 = m_0
x8 = m_1
x9 = m_2
x10 = m_3
x11 = m_4
x12 = m_5
x13 = m_6
x14 = m_7
x15 = m_8
x16 = z_i