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