1/2 a^{v2}_{a0} b^{v0,v1}_{a2,v2} c^{a3}_{a1} gamma1^{a2}_{a3} a+(a0) a+(a1) a-(v1) a-(v0)
-1/2 a^{v2}_{a2} b^{v0,v1}_{a0,v2} c^{a3}_{a1} gamma1^{a2}_{a3} a+(a0) a+(a1) a-(v1) a-(v0)