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The relationship among the three models can be described as a hierarchical or sequential relationship, where A is the starting point and is connected to B, which forms the intermediate link, and B is further connected to C, forming the final link in the chain. This relationship implies that A depends on B for some of its functionalities, and B in turn depends on C for some of its functionalities. Therefore, any changes made to C will impact both B and A, while any changes made to B will impact A. This shows the interdependence of the models and highlights the need for careful consideration when making changes to any of them.