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