-1/8 a^{c0,v2}_{v0,v1} b^{c2,c3}_{c1,a1} c^{a3,a4}_{a0,a2} lambda2^{a1,a2}_{a3,a4} a+(c1) a+(a0) a+(v0) a+(v1) a-(v2) a-(c3) a-(c2) a-(c0)