-1/2 a^{v0,v1}_{c0,c3} b^{c2,c3}_{c1,a1} c^{a2}_{a0} gamma1^{a1}_{a2} a+(c0) a+(c1) a+(a0) a-(v1) a-(v0) a-(c2)
+1/4 a^{v0,v1}_{c1,c2} b^{c1,c2}_{c0,a0} c^{a2}_{a1} a+(c0) a+(a0) a+(a1) a-(v1) a-(v0) a-(a2)
-1/4 a^{v0,v1}_{c1,c2} b^{c1,c2}_{c0,a1} c^{a2}_{a0} gamma1^{a1}_{a2} a+(c0) a+(a0) a-(v1) a-(v0)