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For example, the Protoss player will only be able to produce one unit, the Probe. Typically, at the beginning of a game, a player may only have a few options for technologies to research. The diagram is tree-shaped in the sense that it branches at certain intervals, allowing the player to choose between one of several building sequences in terms of, with the process continuing iteratively further down the tree for additional technologies. These sequences thus unlock and enable various new units or abilities/ research upgrades for use as the game progresses.
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The technology tree, or tech tree is a hierarchical visual representation of the possible building sequences a player can make, in accordance with a selected strategy, build order, or "Meta".
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