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