1/6 a^{a0,a1,a2,a3}_{} b^{}_{a4,a5,a6,v0} eta1^{a6}_{a3} eta1^{a5}_{a2} eta1^{a4}_{a1} a+(v0) a-(a0)
+1/4 a^{a0,a1,a2,a3}_{} b^{}_{a4,a5,a6,v0} eta1^{a6}_{a3} lambda2^{a4,a5}_{a1,a2} a+(v0) a-(a0)
-1/36 a^{a0,a1,a2,a3}_{} b^{}_{a4,a5,a6,v0} lambda3^{a4,a5,a6}_{a1,a2,a3} a+(v0) a-(a0)
+1/12 a^{a0,a1,a2,a5}_{} b^{}_{a3,a4,a6,v0} eta1^{a6}_{a5} a+(a3) a+(a4) a+(v0) a-(a2) a-(a1) a-(a0)
+1/4 a^{a0,a1,a3,a4}_{} b^{}_{a2,a5,a6,v0} eta1^{a6}_{a4} eta1^{a5}_{a3} a+(a2) a+(v0) a-(a1) a-(a0)
+1/8 a^{a0,a1,a3,a4}_{} b^{}_{a2,a5,a6,v0} lambda2^{a5,a6}_{a3,a4} a+(a2) a+(v0) a-(a1) a-(a0)