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