-1/4 a^{a1}_{c0} b^{c2,c3}_{c1,v0} c^{a0,a4}_{a2,a3} lambda2^{a2,a3}_{a1,a4} a+(c0) a+(c1) a+(v0) a-(a0) a-(c3) a-(c2)
+1/2 a^{a1}_{c2} b^{c1,c2}_{c0,v0} c^{a0,a4}_{a2,a3} lambda2^{a2,a3}_{a1,a4} a+(c0) a+(v0) a-(a0) a-(c1)
-1/2 a^{a3}_{c2} b^{c1,c2}_{c0,v0} c^{a1,a2}_{a0,a4} eta1^{a4}_{a3} a+(c0) a+(a0) a+(v0) a-(a2) a-(a1) a-(c1)