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Rather than arbitrarily exclude some sets, install all the base system sets. In my case, my servers need some libraries from the X sets (which is quite common if you have anything that interfaces with graphics of fonts, see here).
The FAQ also mentions that it's better to install all of them unless you really know what you're doing. A generic base VM should really not exclude these, since there's no benefit and may lead to hard-to-track-down issues.