1/6 a^{a0,a4,v0}_{} b^{}_{a1,a2,a3,a5} eta1^{a5}_{a4} a+(a1) a+(a2) a+(a3) a-(v0) a-(a0)
+1/4 a^{a2,a3,v0}_{} b^{}_{a0,a1,a4,a5} eta1^{a5}_{a3} eta1^{a4}_{a2} a+(a0) a+(a1) a-(v0)
+1/8 a^{a2,a3,v0}_{} b^{}_{a0,a1,a4,a5} lambda2^{a4,a5}_{a2,a3} a+(a0) a+(a1) a-(v0)