Orthogonal black di-ring solution

We construct a five dimensional exact solution of the orthogonal black di-ring which has two black rings whose S-1-rotating planes are orthogonal. This solution has four free parameters which represent radii of and speeds of S'-rotation of the black rings. We use the inverse scattering method. This method needs the seed metric. We also present a systematic method how to construct a seed metric. Using this method, we can probably construct other solutions having many black rings on the two orthogonal planes with or without a black hole at the center.