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