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