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