-1/6 a^{}_{c0,a0,a1,a2} b^{c0,a4}_{a3} a+(a0) a+(a1) a+(a2) a+(a3) a-(a4)
+1/2 a^{}_{c0,a0,a1,a3} b^{c0,a4}_{a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2)
-1/2 a^{}_{c0,a0,a1,a3} b^{c1,a4}_{a2} gamma1^{a3}_{a4} a+(c0) a+(a0) a+(a1) a+(a2) a-(c1)