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