a^{a1,v0}_{c0,a0} b^{c0}_{c1} c^{c1}_{v0} a+(a0) a-(a1)
-a^{a1,v0}_{c0,a0} b^{c0}_{c1} c^{c1}_{v1} a+(a0) a+(v1) a-(v0) a-(a1)
+a^{a1,v0}_{c0,a0} b^{c1}_{c2} c^{c2}_{v0} a+(c0) a+(a0) a-(a1) a-(c1)
-a^{a1,v0}_{c2,a0} b^{c1}_{c0} c^{c2}_{v0} a+(c0) a+(a0) a-(a1) a-(c1)
+a^{a1,v0}_{c2,a0} b^{c2}_{c0} c^{c1}_{v0} a+(c0) a+(a0) a-(a1) a-(c1)