1/4 a^{v0}_{c0} b^{a2,a3}_{a0,a1} c^{c2,c3}_{c1,a4} lambda2^{a1,a4}_{a2,a3} a+(c0) a+(c1) a+(a0) a-(v0) a-(c3) a-(c2)
-1/2 a^{v0}_{c2} b^{a2,a3}_{a0,a1} c^{c1,c2}_{c0,a4} eta1^{a4}_{a3} a+(c0) a+(a0) a+(a1) a-(v0) a-(a2) a-(c1)
-1/2 a^{v0}_{c2} b^{a2,a3}_{a0,a1} c^{c1,c2}_{c0,a4} lambda2^{a1,a4}_{a2,a3} a+(c0) a+(a0) a-(v0) a-(c1)