IP logs won't tell you in all/most cases, if people use dynamic IP adresses you won't see a thing. Also it's pretty easy to use a different IP adres when you wanna cheat. I'd say the honor system shoudl do the trick.
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I fed my Dog the American Dream
Well, he rolled over and he started to scream
He said, I dig the taste of salt but it don't keep me alive yeah, yeah
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