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Consider a hypothetical scenario where you are tasked with designing a suspension bridge to span a wide river in a region prone to strong winds and seismic activity. Discuss the key theoretical considerations you would need to account for in the design process. Explain how you would address these challenges to ensure the structural integrity and stability of the bridge under varying environmental conditions. Additionally, explore the theoretical principles behind the selection of materials, structural elements, and support systems to optimize the bridge's performance while minimizing construction costs and environmental impact. Finally, analyze the theoretical implications of your design choices on the long$-$term durability and maintenance requirements of the bridge.