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