code: def containsbb_exclusive(self, x):
          
          left, bottom, right, top = self.aarect().lbrt()
          leftx, bottomx, rightx, topx = x.aarect().lbrt()
          return (left <= leftx) and (bottom <= bottomx) and (right >= rightx) and (top >= topx) and\
                 (not ((left == leftx) and (bottom == bottomx) and (right == rightx) and (top == topx)))
docs: Returns true if the given BoundingBox x is contained within the
          bounding box, where at least one of the boundaries of the box has
          to be exclusive.