Starcraft 2: Hotkey to go to previous selection?

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Is there a function/command/keyboard shortcut that takes you back to your previously selected unit(s)/building(s)?
I know that control-groups are possible and that it's best practice to have hotkeys for army/command centers/production facilities/etc (which I do) but my question is specifically about a "go to previous selection" function.
Seems like a pretty useful function/command and I'm probably overlooking something simple.
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How do I use hotkeys in Starcraft 2?
The standard hotkeys are F5, F6, F7 and F8, you assign the locations using Ctrl+F5/6/7/8 and go to that position pressing F5/6/7/8. You can also have 4 more camera Hotkeys using the Shift+Ctrl+F5/6/7/8 to assign the position and use Shift+F5/6/7/8 to access those 4 extra camera positions. 3) Can I change those keys?Mastering Hotkeys (Grid) [TTG] (Starcraft II Beginners Guide)
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