1/8 a^{a1,a2}_{c0,a0} b^{v0}_{a3} c^{c3,c4}_{c1,c2} lambda2^{a0,a3}_{a1,a2} a+(c0) a+(c1) a+(c2) a-(v0) a-(c4) a-(c3)
-1/2 a^{a1,a2}_{c3,a0} b^{v0}_{a3} c^{c2,c3}_{c0,c1} eta1^{a3}_{a2} a+(c0) a+(c1) a+(a0) a-(v0) a-(a1) a-(c2)
-1/4 a^{a1,a2}_{c3,a0} b^{v0}_{a3} c^{c2,c3}_{c0,c1} lambda2^{a0,a3}_{a1,a2} a+(c0) a+(c1) a-(v0) a-(c2)