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