-1/4 a^{c0,c1}_{a0,a1} b^{v1}_{a2} c^{a3,v0}_{c2,v1} gamma1^{a2}_{a3} a+(c2) a+(a0) a+(a1) a-(v0) a-(c1) a-(c0)
+1/2 a^{c0,c1}_{a0,a2} b^{v1}_{a1} c^{a3,v0}_{c2,v1} gamma1^{a2}_{a3} a+(c2) a+(a0) a+(a1) a-(v0) a-(c1) a-(c0)