-1/2 a^{c1,c2}_{c0,a0} b^{a1,a2}_{c3,v0} c^{v1}_{a3} eta1^{a3}_{a2} gamma1^{a0}_{a1} a+(c0) a+(c3) a+(v0) a-(v1) a-(c2) a-(c1)
+1/4 a^{c1,c2}_{c0,a0} b^{a1,a2}_{c3,v0} c^{v1}_{a3} lambda2^{a0,a3}_{a1,a2} a+(c0) a+(c3) a+(v0) a-(v1) a-(c2) a-(c1)