a^{c1,v0}_{c0,c4} b^{c3,c4}_{c2,v0} c^{}_{} a+(c0) a+(c2) a-(c3) a-(c1)
-1/2 a^{c0,v0}_{c2,c3} b^{c2,c3}_{c1,v0} c^{}_{} a+(c1) a-(c0)
+1/2 a^{c0,v0}_{c2,c3} b^{c2,c3}_{c1,v1} c^{}_{} a+(c1) a+(v1) a-(v0) a-(c0)