-1/2 a^{c0}_{a0} b^{a1,a2}_{c1,v0} c^{v1,v2}_{c2,a3} eta1^{a3}_{a2} gamma1^{a0}_{a1} a+(c1) a+(c2) a+(v0) a-(v2) a-(v1) a-(c0)
+1/4 a^{c0}_{a0} b^{a1,a2}_{c1,v0} c^{v1,v2}_{c2,a3} lambda2^{a0,a3}_{a1,a2} a+(c1) a+(c2) a+(v0) a-(v2) a-(v1) a-(c0)