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