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