How to uininstall gnome3 from Ubuntu 12.10?

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http://askubuntu.com – I recently installed Gnome 3.6 on my Ubuntu computer and decided I didn't like it, so I switched back to Unity. However, now I can't figure out how to uninstall Gnome. I installed it from http://www.gnome.org/getting-gnome/ and clicking the link "click away" at the bottom of the page under "Ubuntu." Do I just need the package name so I can uninstall from the terminal? Or is there a more involved process? Thanks for any help in advance. (HowTos)