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