1/2 a^{c0}_{c2} b^{c1,v0}_{a0,a1} c^{c2}_{v0} a+(a0) a+(a1) a-(c1) a-(c0)
-1/2 a^{c0}_{c2} b^{c2,v0}_{a0,a1} c^{c1}_{v0} a+(a0) a+(a1) a-(c1) a-(c0)