1/2 a^{a1,a4}_{c0,a0} b^{}_{a2,a3,a5,v0} eta1^{a5}_{a4} a+(c0) a+(a0) a+(a2) a+(a3) a+(v0) a-(a1)
+1/2 a^{a2,a3}_{c0,a0} b^{}_{a1,a4,a5,v0} eta1^{a5}_{a3} eta1^{a4}_{a2} a+(c0) a+(a0) a+(a1) a+(v0)
+1/4 a^{a2,a3}_{c0,a0} b^{}_{a1,a4,a5,v0} lambda2^{a4,a5}_{a2,a3} a+(c0) a+(a0) a+(a1) a+(v0)
+1/4 a^{a3,a4}_{c0,a2} b^{}_{a0,a1,a5,v0} lambda2^{a2,a5}_{a3,a4} a+(c0) a+(a0) a+(a1) a+(v0)