1/6 a^{v0}_{a0} b^{a1,a2,a3}_{v0} a+(a0) a-(a3) a-(a2) a-(a1)
+1/2 a^{v0}_{a2} b^{a0,a1,a3}_{v0} gamma1^{a2}_{a3} a-(a1) a-(a0)
-1/2 a^{v0}_{a2} b^{a0,a1,a3}_{v1} gamma1^{a2}_{a3} a+(v1) a-(v0) a-(a1) a-(a0)