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