1 \cdot x_{2} + 1 \cdot x_{3} = k_{56}\\ 1 \cdot x_{4} + 1 \cdot x_{16} = k_{57}\\ 1 \cdot x_{5} + 1 \cdot x_{15} = k_{58}\\ 1 \cdot x_{6} + 1 \cdot x_{17} = k_{59}\\ 1 \cdot x_{7} + 1 \cdot x_{8} = k_{60}\\ 1 \cdot x_{10} + 1 \cdot x_{11} = k_{61}\\ 1 \cdot x_{12} + 1 \cdot x_{13} = k_{62}\\ 1 \cdot x_{20} + 1 \cdot x_{21} = k_{63}