-a^{c1,v0}_{c0,a0} b^{c2}_{c3} c^{c3}_{v0} a+(c0) a+(a0) a-(c2) a-(c1)
+a^{c0,v0}_{c1,a0} b^{c1}_{c2} c^{c2}_{v0} a+(a0) a-(c0)
-a^{c0,v0}_{c1,a0} b^{c1}_{c2} c^{c2}_{v1} a+(a0) a+(v1) a-(v0) a-(c0)
+a^{c0,v0}_{c3,a0} b^{c2}_{c1} c^{c3}_{v0} a+(c1) a+(a0) a-(c2) a-(c0)
-a^{c0,v0}_{c3,a0} b^{c3}_{c1} c^{c2}_{v0} a+(c1) a+(a0) a-(c2) a-(c0)