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