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