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