1 \cdot k_{12} \cdot x_{3} + 1 \cdot k_{12} \cdot x_{17} + 1 \cdot k_{12} \cdot x_{33} = k_{12} \cdot k_{72}\\
1 \cdot k_{12} \cdot x_{7} + 1 \cdot k_{12} \cdot x_{15} + 1 \cdot k_{12} \cdot x_{34} = k_{12} \cdot k_{73}\\
1 \cdot k_{12} \cdot x_{11} + 1 \cdot k_{12} \cdot x_{16} + 1 \cdot k_{12} \cdot x_{27} + 1 \cdot k_{12} \cdot x_{32} = k_{12} \cdot k_{74}\\
1 \cdot k_{12} \cdot x_{20} + 1 \cdot k_{12} \cdot x_{21} + 1 \cdot k_{12} \cdot x_{35} = k_{12} \cdot k_{75}\\
1 \cdot k_{12} \cdot x_{25} + 1 \cdot k_{12} \cdot x_{26} + 1 \cdot k_{12} \cdot x_{27} = k_{12} \cdot k_{76}\\
1 \cdot k_{13} \cdot x_{38} + 1 \cdot k_{13} \cdot x_{39} = k_{13} \cdot k_{77}\\
1 \cdot k_{13} \cdot x_{40} + 1 \cdot k_{13} \cdot x_{41} = k_{13} \cdot k_{78}