1/4 a^{a0}_{c0} b^{c3,v0}_{c1,c2} c^{a3,v1}_{a1,a2} lambda2^{a1,a2}_{a0,a3} a+(c0) a+(c1) a+(c2) a-(v1) a-(v0) a-(c3)
+1/4 a^{a0}_{c2} b^{c2,v0}_{c0,c1} c^{a3,v1}_{a1,a2} lambda2^{a1,a2}_{a0,a3} a+(c0) a+(c1) a-(v1) a-(v0)
+1/2 a^{a2}_{c2} b^{c2,v0}_{c0,c1} c^{a1,v1}_{a0,a3} eta1^{a3}_{a2} a+(c0) a+(c1) a+(a0) a-(v1) a-(v0) a-(a1)