-1/16 a^{c0,c1}_{a1,v0} b^{c2,c3}_{v1,v2} c^{a3,a4}_{a0,a2} lambda2^{a1,a2}_{a3,a4} a+(a0) a+(v0) a+(v1) a+(v2) a-(c3) a-(c2) a-(c1) a-(c0)