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