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