Two-arm
A two-arm universal constructor is one along the lines of the original Gemini spaceship, where two independently programmed construction arms sent gliders in pairs on 90-degree paths to collide with each other at the construction site. Construction recipes for two-arm constructors are much more efficient in general, but they require many more circuits and multiple independent data streams, which both tend to increase the complexity of self-constructing circuitry.
Also see
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gollark: You can call someone an "utter hexahedron" and this is not considered discriminatory.
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