Nested Layouts/Regions in Marionette

// simple one-level nesting (no real nesting), no need for separate areas
- Region
	- View (ItemView, CollectionView, or CompositeView)

// one-level nesting with multiple regions
- Region
	- Layout
		- Region
			- View (ItemView, CollectionView, or CompositeView)
		- Region
			- View (ItemView, CollectionView, or CompositeView)
		- Region
			- View (ItemView, CollectionView, or CompositeView)

// two-level nesting
- Region
	- Layout
		- Region
			- Layout
				- Region
					- View (ItemView, CollectionView, or CompositeView)
				- Region
					- View (ItemView, CollectionView, or CompositeView)
		- Region
			- Layout
				- Region
					- View (ItemView, CollectionView, or CompositeView)

// two-level nesting, mixed (one deeper than the other)
- Region
	- Layout
		- Region
			- Layout
				- Region
					- View (ItemView, CollectionView, or CompositeView)
				- Region
					- View (ItemView, CollectionView, or CompositeView)
		- Region
			- View (ItemView, CollectionView, or CompositeView)