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	Interface	Description
	IUndoCommand	The Undo/Redo interface used by the undo/redo stack

	Class	Description
	AggregateUndoCommand	Handles a set of synchronous commands as a single undoable operation.
	UndoCommand	A suitable base class that implements the IUndoCommand interface.
	UndoStackCommand	An command class that operates on the undo group used by the UndoFrontController.