1/2 a^{}_{a0,a3} b^{a1,a2,a4}_{c0} gamma1^{a3}_{a4} a+(c0) a+(a0) a-(a2) a-(a1)
+1/2 a^{}_{a1,a2} b^{a0,a3,a4}_{c0} gamma1^{a2}_{a4} gamma1^{a1}_{a3} a+(c0) a-(a0)
+1/4 a^{}_{a1,a2} b^{a0,a3,a4}_{c0} lambda2^{a1,a2}_{a3,a4} a+(c0) a-(a0)