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Close
Close closes the currently selected notebook.
When you close notebook windows, Mathematica asks if you want to save any changes made since your previous save.
Keyboard shortcuts: F4 (Windows); w (Macintosh); w (X).
Close closes the currently selected notebook. When you close notebook windows, Mathematica asks if you want to save any changes made since your previous save. Keyboard shortcuts: 
F4 
(Windows); 
w (Macintosh); w (X).
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