code: def same_shape(self, objects: Set[Object]) -> Set[Object]:
          
          return self._get_objects_with_same_attribute(objects, lambda x: x.shape)
docs: Filters the set of objects, and returns those objects whose color is the most frequent
          color in the initial set of objects, if the highest frequency is greater than 1, or an
          empty set otherwise.
  
          This is an unusual name for what the method does, but just as ``triangle`` filters objects
          to those that are triangles, this filters objects to those that are of the same shape.