-1/8 a^{a1,a2}_{a0,v0} b^{c0,v2}_{a3,v1} c^{c3,c4}_{c1,c2} lambda2^{a0,a3}_{a1,a2} a+(c1) a+(c2) a+(v0) a+(v1) a-(v2) a-(c4) a-(c3) a-(c0)