x_{36} = x_{10} + x_{12} + x_{17}\\ x_{37} = x_{36} / 8\\ x_{38} = 8 \cdot \left(x_{2} + x_{5} + x_{6}\right) + x_{8} + x_{9} + x_{18} + x_{19} + x_{15} + x_{16}\\ x_{39} = x_{38} / 8\\ 1 \cdot k_{49} \cdot x_{1} + 1 \cdot k_{49} \cdot x_{2} = k_{49} \cdot k_{57}\\ 1 \cdot k_{49} \cdot x_{4} + 1 \cdot k_{49} \cdot x_{5} = k_{49} \cdot k_{58}