1/2 a^{}_{c0,a0,a1,a3} b^{c2,a4}_{c1,a2} gamma1^{a3}_{a4} a+(c0) a+(c1) a+(a0) a+(a1) a+(a2) a-(c2)
-1/6 a^{}_{c1,a0,a1,a2} b^{c1,a4}_{c0,a3} a+(c0) a+(a0) a+(a1) a+(a2) a+(a3) a-(a4)
+1/2 a^{}_{c1,a0,a1,a3} b^{c1,a4}_{c0,a2} gamma1^{a3}_{a4} a+(c0) a+(a0) a+(a1) a+(a2)