1/2 a^{v0,v1}_{c2,a0} b^{c0,c2}_{a1,a3} c^{a4,v2}_{c1,a2} gamma1^{a3}_{a4} a+(c1) a+(a0) a+(a1) a+(a2) a-(v2) a-(v1) a-(v0) a-(c0)
+1/4 a^{v0,v1}_{c2,a3} b^{c0,c2}_{a0,a1} c^{a4,v2}_{c1,a2} gamma1^{a3}_{a4} a+(c1) a+(a0) a+(a1) a+(a2) a-(v2) a-(v1) a-(v0) a-(c0)