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You can easily combine 2 requirements, just add both of the conditions to one requirement, connected with an And - node.
As of how to restrict the building to one, check the Mothership-requirement, which is just the same thing.
You can easily combine 2 requirements, just add both of the conditions to one requirement, connected with an And - node.
As of how to restrict the building to one, check the Mothership-requirement, which is just the same thing.