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Let be a hyperbolic transformation. Let B be a new band attaching to L such that is also a hyperbolic transformation. In this paper, we will study the relationship between the realizing surfaces and . If B is a noncoherent band to both L and such that is defined, then and are ambient isotopic, where RP2 is one of the standard real projective planes. We will study the triviality of because as an application, RP2 can untangle some knotted sphere with suitable conditions, when it is attached to by the connected sum.