1/2 a^{a2,v0}_{a0,a1} b^{a3}_{v0} c^{}_{} lambda2^{a0,a1}_{a2,a3}
-1/2 a^{a2,v0}_{a0,a1} b^{a3}_{v1} c^{}_{} lambda2^{a0,a1}_{a2,a3} a+(v1) a-(v0)
+a^{a1,v0}_{a0,a2} b^{a3}_{v0} c^{}_{} gamma1^{a2}_{a3} a+(a0) a-(a1)