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