text: from . import Cl
  layout, blades = Cl(5, 3)
  locals().update(blades)
  
  n1 = e3 + e6
  n2 = e4 + e7
  n3 = e5 + e8
  
  n1b = 0.5*(e6 - e3)
  n2b = 0.5*(e7 - e4)
  n3b = 0.5*(e8 - e5)
  
  
  def up(x):
      a = x[e1]
      b = x[e2]
      return a*e1 + b*e2 + 0.5*a**2*n1 + n1b + 0.5*b**2*n2 + n2b + a*b*n3
  
  
  def down(x):
      return (x|e1)[0]*e1 + (x|e2)[0]*e2
  
  