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