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