1/2 a^{v1}_{v0} b^{a0,v2}_{c0,a1} c^{a3,a4}_{c1,a2} lambda2^{a1,a2}_{a3,a4} a+(c0) a+(c1) a+(v0) a-(v2) a-(v1) a-(a0)
-a^{v1}_{v0} b^{a2,v2}_{c0,a1} c^{a0,a4}_{c1,a3} eta1^{a3}_{a2} gamma1^{a1}_{a4} a+(c0) a+(c1) a+(v0) a-(v2) a-(v1) a-(a0)
-a^{v1}_{v0} b^{a2,v2}_{c0,a1} c^{a0,a4}_{c1,a3} lambda2^{a1,a3}_{a2,a4} a+(c0) a+(c1) a+(v0) a-(v2) a-(v1) a-(a0)