x_{15} = \left(x_{3} \cdot k_{22} + x_{4} \cdot k_{23} + x_{5} \cdot k_{24} + x_{6} \cdot k_{22} + x_{7} \cdot k_{23} + x_{8} \cdot k_{24}\right) / k_{20}\\ x_{16} = \left(x_{9} \cdot k_{22} + x_{10} \cdot k_{23} + x_{11} \cdot k_{24} + x_{12} \cdot k_{22} + x_{13} \cdot k_{23} + x_{14} \cdot k_{24}\right) / k_{20}\\ x_{17} = \left(x_{3} \cdot k_{22} + x_{4} \cdot k_{23} + x_{5} \cdot k_{24} + x_{9} \cdot k_{22} + x_{10} \cdot k_{23} + x_{11} \cdot k_{24}\right) / k_{20}\\ x_{18} = \left(x_{6} \cdot k_{22} + x_{7} \cdot k_{23} + x_{8} \cdot k_{24} + x_{12} \cdot k_{22} + x_{13} \cdot k_{23} + x_{14} \cdot k_{24}\right) / k_{20}\\ x_{19} = \left(x_{3} \cdot k_{22} + x_{6} \cdot k_{22} + x_{9} \cdot k_{22} + x_{12} \cdot k_{22}\right) / k_{20}\\ x_{20} = \left(x_{4} \cdot k_{23} + x_{7} \cdot k_{23} + x_{10} \cdot k_{23} + x_{13} \cdot k_{23}\right) / k_{20}\\ x_{21} = \left(x_{5} \cdot k_{24} + x_{8} \cdot k_{24} + x_{11} \cdot k_{24} + x_{14} \cdot k_{24}\right) / k_{20}\\ x_{22} = \left(x_{19} \cdot k_{20} + x_{20} \cdot k_{20} + x_{21} \cdot k_{20}\right) / k_{20}\\ x_{43} = x_{22} / k_{19}