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Is there a way to open/close all collapsed/open cells? The reason is for a long notebook, it is convenient to see all the section and subsection headings at once.

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STEP 1: Select All (Edit Menu -> Select All). ............STEP 2: Cell Menu -> Grouping -> Close All Subgroups – wolfies Aug 6 '13 at 17:59
Ctrl+A,Ctrl+Shift+] – Hector Aug 7 '13 at 17:05

(Per Hector's comment)

Ctrl+A to select all cells and Ctrl+Shift+] to close them. Ctrl+Shift+[ opens closed cells.

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