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