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