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An instance of MultipleSelectListBox responds to the
selection message with the index of the first item selected; it
responds to the selections message with an ordered collection of the
indexes selected. Alter the definition of createViews shown in
Segment 692 such that createViews creates a
MultipleSelectionListBox instance. Then, alter the definition of
itemSelected such that the answers produced by both the
selection and the selections messages are displayed
whenever an item is selected.