1/2 a^{a1}_{c0} b^{a0,a4}_{a2,a3} c^{c2}_{c1} lambda2^{a2,a3}_{a1,a4} a+(c0) a+(c1) a-(a0) a-(c2)
+1/2 a^{a1}_{c1} b^{a0,a4}_{a2,a3} c^{c1}_{c0} lambda2^{a2,a3}_{a1,a4} a+(c0) a-(a0)
+1/2 a^{a3}_{c1} b^{a1,a2}_{a0,a4} c^{c1}_{c0} eta1^{a4}_{a3} a+(c0) a+(a0) a-(a2) a-(a1)