1/2 a^{}_{a0,a1} b^{c0,a2,a3,v0}_{} gamma1^{a1}_{a3} gamma1^{a0}_{a2} a-(v0) a-(c0)
+1/4 a^{}_{a0,a1} b^{c0,a2,a3,v0}_{} lambda2^{a0,a1}_{a2,a3} a-(v0) a-(c0)
-a^{}_{a0,a2} b^{c0,a1,a3,v0}_{} gamma1^{a2}_{a3} a+(a0) a-(v0) a-(a1) a-(c0)