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U-6 is a simplified version of the Curtis Model II Spatial Autoregressive (SAR) fractal model, developed by Robert Curtis. It is designed to represent complex processes in spatial terms. It considers five different types of interactions between locations and their respective spatial connections—temporal, distance, adjacency, directional, and multiple structural relationships. Using these five categories, U-6 is capable of modeling dynamic, spatial processes over time, accounting for dynamic changes in spatial structures and the effects of neighboring sites in influencing the system. The model provides detailed information about spatially distributed phenomena and can help with the analysis of systems that have multi-dimensional behavior or multiple components.