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