The commandset switch upgrade allowing you to change your commandset back and forth as much as you want unless it's for regular generals then you can have the upgrade only like 4 times and use them non-stop for those for structure/units. Like you can have 100 of 4 different buildings and the upgrades will work, but if you put it on a fifth building then you can only get to the second commandset once with that building and the others will still work fine.
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