L 2 M 4 + M 4 + L ( − M 8 + M 6 + 2 M 4 + M 2 − 1 ) {\displaystyle L^{2}M^{4}+M^{4}+L\left(-M^{8}+M^{6}+2M^{4}+M^{2}-1\right)}
