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FilledSmallSquareCellGroupData[, , ... , Open] represents an open group of cells in a notebook.

FilledSmallSquareCellGroupData[, , ... , Closed] represents a closed group of cells.

FilledSmallSquare When a group of cells is closed, only the first member of the group is visible.

FilledSmallSquare When cells are entered into a notebook, they are automatically placed in groups unless CellGrouping->Manual is set.

FilledSmallSquare See The Mathematica Book: Section 2.10.7.

FilledSmallSquare See also: Cell, CellGrouping, CellOpen.