Let $$(L,.)$$ be a Lie superalgebra endowed with an even supersymmetric non-degenerate and invariant bilinear form $$B$$ (i.e $$(L,.,B)$$ is a quadratic Lie superalgebra). If we have the equality $$B(x,y.z)=(-1)^{\vert x\vert +\vert y\vert +\vert z\vert }B(x,z.y)$$, what can we conclude using the non-degeneracy of $$B$$?