-1/6 a^{}_{c0,c1,c2,a0} b^{c4,a1}_{c3} gamma1^{a0}_{a1} a+(c0) a+(c1) a+(c2) a+(c3) a-(c4)
+1/2 a^{}_{c0,c1,c3,a0} b^{c3,a1}_{c2} a+(c0) a+(c1) a+(c2) a+(a0) a-(a1)
+1/2 a^{}_{c0,c1,c3,a0} b^{c3,a1}_{c2} gamma1^{a0}_{a1} a+(c0) a+(c1) a+(c2)