1/8 a^{c1,c2}_{c0,v0} b^{a0,a3}_{a1,a2} c^{a4,v1}_{c3,c4} lambda2^{a1,a2}_{a3,a4} a+(c0) a+(c3) a+(c4) a+(v0) a-(v1) a-(a0) a-(c2) a-(c1)