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