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