1/4 a^{a0,a1,a2}_{c0} b^{}_{c1,c2,a3,a4} eta1^{a4}_{a2} eta1^{a3}_{a1} a+(c0) a+(c1) a+(c2) a-(a0)
+1/8 a^{a0,a1,a2}_{c0} b^{}_{c1,c2,a3,a4} lambda2^{a3,a4}_{a1,a2} a+(c0) a+(c1) a+(c2) a-(a0)
-1/4 a^{a0,a1,a3}_{c0} b^{}_{c1,c2,a2,a4} eta1^{a4}_{a3} a+(c0) a+(c1) a+(c2) a+(a2) a-(a1) a-(a0)