1/2 a^{v0,v1}_{c0,c3} b^{c1,c3}_{a0,a1} c^{a2}_{c2} gamma1^{a1}_{a2} a+(c0) a+(c2) a+(a0) a-(v1) a-(v0) a-(c1)
+1/8 a^{v0,v1}_{c1,c2} b^{c1,c2}_{a0,a1} c^{a2}_{c0} a+(c0) a+(a0) a+(a1) a-(v1) a-(v0) a-(a2)
+1/4 a^{v0,v1}_{c1,c2} b^{c1,c2}_{a0,a1} c^{a2}_{c0} gamma1^{a1}_{a2} a+(c0) a+(a0) a-(v1) a-(v0)