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