1/2 a^{a0}_{c0} b^{a2,a3}_{c1,a1} c^{v0}_{a4} lambda2^{a1,a4}_{a2,a3} a+(c0) a+(c1) a-(v0) a-(a0)
-a^{a1}_{c0} b^{a0,a3}_{c1,a2} c^{v0}_{a4} eta1^{a4}_{a3} eta1^{a2}_{a1} a+(c0) a+(c1) a-(v0) a-(a0)
-a^{a1}_{c0} b^{a0,a3}_{c1,a2} c^{v0}_{a4} lambda2^{a2,a4}_{a1,a3} a+(c0) a+(c1) a-(v0) a-(a0)