Include all the example that I think it is need to know to improve your Qt skill.
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Qt Version was used: 5.9.9 http://download.qt.io/official_releases/qt/5.9/5.9.9/qt-opensource-windows-x86-5.9.9.exe or https://download.qt.io/archive/qt/5.9/5.9.9/ https://download.qt.io/archive/qt/