Given fractional coordinates in the lll basis, returns corresponding
        fractional coordinates in the lattice basis.

def get_frac_coords_from_lll(self, lll_frac_coords: Vector3Like) -> np.ndarray:
        """
        Given fractional coordinates in the lll basis, returns corresponding
        fractional coordinates in the lattice basis.
        """
        return dot(lll_frac_coords, self.lll_mapping)