-1/4 a^{a0,a1}_{c2,a2} b^{c0,a3}_{v0,v1} c^{c2}_{c1} gamma1^{a2}_{a3} a+(c1) a+(v0) a+(v1) a-(a1) a-(a0) a-(c0)
+1/4 a^{a0,a1}_{c2,a2} b^{c2,a3}_{v0,v1} c^{c1}_{c0} gamma1^{a2}_{a3} a+(c0) a+(v0) a+(v1) a-(a1) a-(a0) a-(c1)