-1/2 a^{c1,v0}_{c0,c2} b^{c2}_{c3} c^{c3,a2}_{a0,a1} a+(c0) a+(a0) a+(a1) a-(v0) a-(a2) a-(c1)
-1/2 a^{c0,v0}_{c2,c3} b^{c2}_{c1} c^{c3,a2}_{a0,a1} a+(c1) a+(a0) a+(a1) a-(v0) a-(a2) a-(c0)