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