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This web page had the following on the homepage, "Hopf solitons in modern mathematical physics." Our analyzers saw that the web page said " What does hopfion mean? A hopfion or Hopf soliton is a topological soliton which is classified by the Hopf invariant and has non-zero Hopf index." The Website also said " In theory, the physical nature of hopfions may be different. First of all, the vector field 1. Itself may be normalized physical quantity 1. Like the normalized magnetization vector in ferromagnetism. Second, the lines of preimages 1. Of vectors may correspond to physical quantities 1." The website's header had hopfion as the most important optimized keyword. It is followed by soliton, hopf soliton, and hopf index which isn't as highly ranked as hopfion. The next words hopfion.com uses is preimages.