I have been researching SEO and I am aware that Content is King etc. but now i come to a more specific thing, SEO friendly URL, which is widely discussed by public. I also read Google's Webmaster guide where it talks about duplicate content which generally means that a same page of content should not be pulled up by more than one URL.
So I tested what happens to my website on Stack Overflow, but I actually find out the same "issue" (maybe this is not an issue).
The following URLs has same content, could anyone shed some light here?