undo
....\undo
....\undo.sln
....\undo.suo
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....\....\Class1.cs
....\....\Form1.cs
....\....\Form1.Designer.cs
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....\....\Form2.resx
....\....\IUndoRedo.cs
....\....\MyButton.cs
....\....\MyDataGridView.cs
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....\....\...\x86
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....\....\...\...\.....\DesignTimeResolveAssemblyReferences.cache
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....\....\undo.csproj