a^{a0,a2}_{c0,a1} b^{}_{} c^{a4}_{a3} eta1^{a3}_{a2} gamma1^{a1}_{a4} a+(c0) a-(a0)
+a^{a0,a2}_{c0,a1} b^{}_{} c^{a4}_{a3} lambda2^{a1,a3}_{a2,a4} a+(c0) a-(a0)
+1/2 a^{a2,a3}_{c0,a1} b^{}_{} c^{a0}_{a4} lambda2^{a1,a4}_{a2,a3} a+(c0) a-(a0)