1/16 a^{a0,a3}_{a1,a2} b^{c0,a4}_{v0,v1} c^{c3,c4}_{c1,c2} lambda2^{a1,a2}_{a3,a4} a+(c1) a+(c2) a+(v0) a+(v1) a-(a0) a-(c4) a-(c3) a-(c0)