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