1/4 a^{c2,a1}_{c0,c1} b^{a0,a4}_{a2,a3} c^{c4}_{c3} lambda2^{a2,a3}_{a1,a4} a+(c0) a+(c1) a+(c3) a-(a0) a-(c4) a-(c2)
+1/2 a^{c1,a1}_{c0,c3} b^{a0,a4}_{a2,a3} c^{c3}_{c2} lambda2^{a2,a3}_{a1,a4} a+(c0) a+(c2) a-(a0) a-(c1)
+1/2 a^{c1,a3}_{c0,c3} b^{a1,a2}_{a0,a4} c^{c3}_{c2} eta1^{a4}_{a3} a+(c0) a+(c2) a+(a0) a-(a2) a-(a1) a-(c1)