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