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