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