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google is still available, although I wouldn't register that since I doubt you'll get to keep it long

I think dictionary words don't work, I guess maybe google is a verb and isn't available :P

I couldn't find any mention of that in the help, but it sounds like a valid limitation. Do you know of any supporting documentation?

I'm just guessing from what I saw. I don't have any supporting documentation, sorry :). I edited my comment to make it a bit more clear.