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