1/4 a^{c0,a0}_{v0,v1} b^{a3,v2}_{a1,a2} c^{c1}_{v2} lambda2^{a1,a2}_{a0,a3} a+(v0) a+(v1) a-(c1) a-(c0)
-1/4 a^{c0,a0}_{v0,v1} b^{a3,v2}_{a1,a2} c^{c1}_{v3} lambda2^{a1,a2}_{a0,a3} a+(v0) a+(v1) a+(v3) a-(v2) a-(c1) a-(c0)
+1/2 a^{c0,a2}_{v0,v1} b^{a1,v2}_{a0,a3} c^{c1}_{v2} eta1^{a3}_{a2} a+(a0) a+(v0) a+(v1) a-(a1) a-(c1) a-(c0)