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