you have 6 lines
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-------
-------
-------
-------
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each represents a string
the bottom line represents the lowest string (E)
the top string represents the highest
The numbers on each line represent which fret you need to use on which string
------2---
----3-----
---------2
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----------
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the spacing provides the beat for the song
for lots of good tabs go to http://www.guitartab.cc/home.php