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