x_{27} = \operatorname{piecewise}(0, t < -1, \operatorname{piecewise}(0, t < 0, 10))\\
x_{28} = \operatorname{piecewise}(0, t < -1, \operatorname{piecewise}(0, t < 0, 10))\\
x_{29} = k_{27} \cdot x_{2}\\
x_{30} = k_{28} \cdot x_{6}\\
x_{31} = k_{29} \cdot x_{8}\\
x_{32} = k_{30} \cdot x_{10}\\
x_{33} = k_{31} \cdot x_{12}\\
x_{34} = k_{32} \cdot x_{24}\\
x_{35} = k_{33} \cdot x_{14}\\
x_{36} = k_{34} \cdot x_{16}\\
x_{37} = k_{35} \cdot x_{18}\\
x_{38} = k_{36} \cdot x_{20}\\
x_{39} = k_{37} \cdot x_{22}\\
1 \cdot k_{38} \cdot x_{1} + 1 \cdot k_{38} \cdot x_{2} + 1 \cdot k_{38} \cdot x_{3} = k_{38} \cdot k_{39}\\
1 \cdot k_{38} \cdot x_{4} + 1 \cdot k_{38} \cdot x_{5} + 1 \cdot k_{38} \cdot x_{6} = k_{38} \cdot k_{40}\\
1 \cdot k_{38} \cdot x_{7} + 1 \cdot k_{38} \cdot x_{8} = k_{38} \cdot k_{41}\\
1 \cdot k_{38} \cdot x_{9} + 1 \cdot k_{38} \cdot x_{10} = k_{38} \cdot k_{42}\\
1 \cdot k_{38} \cdot x_{11} + 1 \cdot k_{38} \cdot x_{12} = k_{38} \cdot k_{43}\\
1 \cdot k_{38} \cdot x_{13} + 1 \cdot k_{38} \cdot x_{14} = k_{38} \cdot k_{44}\\
1 \cdot k_{38} \cdot x_{15} + 1 \cdot k_{38} \cdot x_{16} = k_{38} \cdot k_{45}\\
1 \cdot k_{38} \cdot x_{17} + 1 \cdot k_{38} \cdot x_{18} = k_{38} \cdot k_{46}\\
1 \cdot k_{38} \cdot x_{19} + 1 \cdot k_{38} \cdot x_{20} = k_{38} \cdot k_{47}\\
1 \cdot k_{38} \cdot x_{21} + 1 \cdot k_{38} \cdot x_{22} = k_{38} \cdot k_{48}\\
1 \cdot k_{38} \cdot x_{23} + 1 \cdot k_{38} \cdot x_{24} = k_{38} \cdot k_{49}\\
1 \cdot k_{38} \cdot x_{25} + 1 \cdot k_{38} \cdot x_{26} = k_{38} \cdot k_{50}