a^{c0}_{v0} b^{a1,a2}_{c1,a0} c^{c1}_{a3} eta1^{a3}_{a2} a+(a0) a+(v0) a-(a1) a-(c0)
+1/2 a^{c0}_{v0} b^{a1,a2}_{c1,a0} c^{c1}_{a3} lambda2^{a0,a3}_{a1,a2} a+(v0) a-(c0)
-1/2 a^{c0}_{v0} b^{a1,a2}_{c1,a0} c^{c2}_{a3} lambda2^{a0,a3}_{a1,a2} a+(c1) a+(v0) a-(c2) a-(c0)