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