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Built-in Mathematica Symbol

CellGroup

CellGroup[{cell₁, cell₂, ...}]
gives an open group of cells that can appear in a Mathematica notebook.

CellGroup[{cell₁, cell₂, ...}, 1]
gives a cell group in which only the first cell is open.

CellGroup[{cell₁, cell₂, ...}, -1]
gives a cell group in which only the last cell is open.

CellGroup[{cell₁, cell₂, ...}, {i₁, i₂, ...}]
gives a cell group in which cells i₁, i₂, ... are open.

A CellGroup object can be inserted in its entirety into a notebook using CellPrint.

Cell grouping specified by CellGroup will be overridden by automatic grouping in a notebook unless CellGrouping->Manual is set.

If any cell_i is a string or Text object, it will be wrapped with TextCell. If it is any other type of expression, it will be wrapped with ExpressionCell.

You can nest one cell group within another:

Show only the first cell in the group:

Show only the second cell in the group:

Show only the first and last cells:

By default, notebooks use automatic grouping that ignores CellGroup structures: