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