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How to completely remove Qt environment?

I installed Qt Creator Integrated Development from the Ubuntu Software Center, then I compiled and installed Qt 4.8.6. There were few errors when I try to compile an application.

I uninstalled/removed it via the Ubuntu Software Center.

But when I tried to install Qt 5.3 I can see the Qt 4.8 kit and recently accessed files.

What should I do if I want to completely remove the Qt in my system? I want to uninstall all the 4.8.6 and, then try to reinstall the 5.3.

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