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