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