-a^{c0}_{v0} b^{a0,a1}_{c1,c4} c^{c3,c4}_{c2,a2} eta1^{a2}_{a1} a+(c1) a+(c2) a+(v0) a-(a0) a-(c3) a-(c0)
+1/4 a^{c0}_{v0} b^{a0,a1}_{c2,c3} c^{c2,c3}_{c1,a2} a+(c1) a+(a2) a+(v0) a-(a1) a-(a0) a-(c0)
+1/2 a^{c0}_{v0} b^{a0,a1}_{c2,c3} c^{c2,c3}_{c1,a2} eta1^{a2}_{a1} a+(c1) a+(v0) a-(a0) a-(c0)