-1/2 a^{c0,v0}_{c3,a0} b^{v1}_{a1} c^{c3,a2}_{c1,c2} gamma1^{a1}_{a2} a+(c1) a+(c2) a+(a0) a-(v1) a-(v0) a-(c0)
+1/2 a^{c0,v0}_{c3,a1} b^{v1}_{a0} c^{c3,a2}_{c1,c2} gamma1^{a1}_{a2} a+(c1) a+(c2) a+(a0) a-(v1) a-(v0) a-(c0)