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