how to identify duplicate content issue?
This question has been asked and answered many, many times before. Please read the [SEO FAQ or use the [url=http://www.sitepoint.com/forums/search.php]Search](http://www.sitepoint.com/forums/showthread.php?182915-FAQ-Search-Engine-Optimization) facility to find past discussions.
If, after reading those, you've still got any specific questions that haven't been answered, please do come back and start a new thread. In the meantime, I'm closing this one.