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