1/2 a^{c0,v0}_{c3,a0} b^{c3,v2}_{c1,c2} c^{v1}_{v2} a+(c1) a+(c2) a+(a0) a-(v1) a-(v0) a-(c0)
-1/2 a^{c0,v2}_{c3,a0} b^{c3,v0}_{c1,c2} c^{v1}_{v2} a+(c1) a+(c2) a+(a0) a-(v1) a-(v0) a-(c0)