-1/4 a^{v0}_{c0} b^{a0,a1}_{c1,c2} c^{a4,v1}_{a2,a3} lambda2^{a2,a3}_{a1,a4} a+(c0) a+(c1) a+(c2) a-(v1) a-(v0) a-(a0)
-1/4 a^{v0}_{c0} b^{a1,a2}_{c1,c2} c^{a0,v1}_{a3,a4} eta1^{a4}_{a2} eta1^{a3}_{a1} a+(c0) a+(c1) a+(c2) a-(v1) a-(v0) a-(a0)
-1/8 a^{v0}_{c0} b^{a1,a2}_{c1,c2} c^{a0,v1}_{a3,a4} lambda2^{a3,a4}_{a1,a2} a+(c0) a+(c1) a+(c2) a-(v1) a-(v0) a-(a0)