-a^{v0,v1}_{c0,a0} b^{c0,a2}_{a1,v1} c^{}_{} a+(a0) a+(a1) a-(v0) a-(a2)
-a^{v0,v1}_{c0,a1} b^{c0,a2}_{a0,v1} c^{}_{} gamma1^{a1}_{a2} a+(a0) a-(v0)
-a^{v0,v1}_{c0,a1} b^{c1,a2}_{a0,v1} c^{}_{} gamma1^{a1}_{a2} a+(c0) a+(a0) a-(v0) a-(c1)
+1/2 a^{v0,v1}_{c0,a1} b^{c0,a2}_{a0,v2} c^{}_{} gamma1^{a1}_{a2} a+(a0) a+(v2) a-(v1) a-(v0)