4.) Mass extrator upgrade: as many I tend to boost the upgrade using engineers or/and the ACU. while doing that i try to put my engineers in a clear area next to the Mex first then command them to assist (all that using SHIFT key of course). why do i do that? because my engineers often end up being idled and there is no indicator in that situation and sometimes when you have loads of other engineers around it's difficult to pick the right one.
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