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