-1/2 a^{c1,a0}_{c0,v0} b^{a2,a3}_{c2,a1} c^{v1}_{a4} lambda2^{a1,a4}_{a2,a3} a+(c0) a+(c2) a+(v0) a-(v1) a-(a0) a-(c1)
+a^{c1,a1}_{c0,v0} b^{a0,a3}_{c2,a2} c^{v1}_{a4} eta1^{a4}_{a3} eta1^{a2}_{a1} a+(c0) a+(c2) a+(v0) a-(v1) a-(a0) a-(c1)
+a^{c1,a1}_{c0,v0} b^{a0,a3}_{c2,a2} c^{v1}_{a4} lambda2^{a2,a4}_{a1,a3} a+(c0) a+(c2) a+(v0) a-(v1) a-(a0) a-(c1)