-1/8 a^{a0}_{a1} b^{c2,c3}_{c0,c1} c^{a3,a4}_{c4,a2} lambda2^{a1,a2}_{a3,a4} a+(c0) a+(c1) a+(c4) a-(a0) a-(c3) a-(c2)
+1/4 a^{a2}_{a1} b^{c2,c3}_{c0,c1} c^{a0,a4}_{c4,a3} eta1^{a3}_{a2} gamma1^{a1}_{a4} a+(c0) a+(c1) a+(c4) a-(a0) a-(c3) a-(c2)
+1/4 a^{a2}_{a1} b^{c2,c3}_{c0,c1} c^{a0,a4}_{c4,a3} lambda2^{a1,a3}_{a2,a4} a+(c0) a+(c1) a+(c4) a-(a0) a-(c3) a-(c2)