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