-1/2 a^{c0,v0}_{a0,a1} b^{a2,v2}_{c1,c2} c^{v1}_{v2} gamma1^{a1}_{a2} a+(c1) a+(c2) a+(a0) a-(v1) a-(v0) a-(c0)
+1/2 a^{c0,v2}_{a0,a1} b^{a2,v0}_{c1,c2} c^{v1}_{v2} gamma1^{a1}_{a2} a+(c1) a+(c2) a+(a0) a-(v1) a-(v0) a-(c0)