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