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