-1/2 a^{a0,a1}_{c0} b^{c3}_{c1,c2,a2} eta1^{a2}_{a1} a+(c0) a+(c1) a+(c2) a-(a0) a-(c3)
-1/4 a^{a0,a1}_{c2} b^{c2}_{c0,c1,a2} a+(c0) a+(c1) a+(a2) a-(a1) a-(a0)
+1/2 a^{a0,a1}_{c2} b^{c2}_{c0,c1,a2} eta1^{a2}_{a1} a+(c0) a+(c1) a-(a0)