-contains single compound, the sub-shapes shared between all possible couples of its top-level shapes
-are searched; otherwise, only sub-shapes that are shared between first input shape and all rest input
-shapes are searched.
+contains a single compound, the sub-shapes shared between all possible couples of its top-level shapes
+are searched for; otherwise, only sub-shapes that are shared between the first input shape and
+all other input shapes are searched.