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