code: def is_rectilinear(self):
          
          a, b, c, d, e, f, g, h, i = self
          return (abs(a) < EPSILON and abs(e) < EPSILON) or (
              abs(d) < EPSILON and abs(b) < EPSILON
          )
docs: True if the transform is rectilinear, i.e., whether a shape would
          remain axis-aligned, within rounding limits, after applying the
          transform.