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