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 , , ... are open.

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