a^{a1}_{a0} b^{}_{} c^{c1,a3}_{c0,a2} eta1^{a2}_{a1} gamma1^{a0}_{a3} a+(c0) a-(c1)
+a^{a1}_{a0} b^{}_{} c^{c1,a3}_{c0,a2} lambda2^{a0,a2}_{a1,a3} a+(c0) a-(c1)