i hope this site helps.
This is how to ollie
http://gaster-skatetricks.blogspot.com/2009/10/how-to-ollie.html
And this is how to pop shuv it
http://gaster-skatetricks.blogspot.com/2009/10/how-to-pop-shuv-it.html
Maybe you could be able to distinguish the two if you learn it properly.
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