Returns a new list (of the same class as the receiver) containing selected items from the receiver list. The first item in the new list is the item corresponding to index start in the receiver list. Subsequent items in the new list correspond to those in the receiver list (in the same sequence). If you specify the whole number items, the new list contains only this number of items (or the number of subsequent items in the receiver list, if this is less than items). If you do not specify items, the new list contains all subsequent items from the receiver list. The receiver list remains unchanged.