1/4 a^{a0,a1,a2}_{v0} b^{}_{c0,c1,a3,a4} eta1^{a4}_{a2} eta1^{a3}_{a1} a+(c0) a+(c1) a+(v0) a-(a0)
+1/8 a^{a0,a1,a2}_{v0} b^{}_{c0,c1,a3,a4} lambda2^{a3,a4}_{a1,a2} a+(c0) a+(c1) a+(v0) a-(a0)
+1/4 a^{a0,a1,a3}_{v0} b^{}_{c0,c1,a2,a4} eta1^{a4}_{a3} a+(c0) a+(c1) a+(a2) a+(v0) a-(a1) a-(a0)