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resources on upgrades or research. Some of these upgrades enhance the player's entire economy. Other upgrades apply to a unit or class of units, and unlock or enhance certain combat abilities. Sometimes enhancements are enabled by building a structure that enables more advanced structures. Games with a large number of upgrades often feature a technology tree, which is a series of advancements that players can research to unlock new units, buildings, and other capabilities. Technology trees are quite large

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