I know this is probably something very simple, but I just don't see a way to do it. I know I can select multiple systems by clicking on the star, but often those are hard to find. I can search for specific stars but that will only find the ones with a common property and even then I can only select one at a time. Using shift or ctrl and selecting another just gives me the second selection. What if I wanted to select Sol and Omicron Persei 8? I have no idea how to do that with the natural language filter as it doesn't seem to like "or".