1/2 a^{}_{c0,c1,a0,a1} b^{c1,a3}_{a2} a+(c0) a+(a0) a+(a1) a+(a2) a-(a3)
-a^{}_{c0,c1,a0,a2} b^{c1,a3}_{a1} gamma1^{a2}_{a3} a+(c0) a+(a0) a+(a1)
-1/2 a^{}_{c0,c1,a0,a2} b^{c2,a3}_{a1} gamma1^{a2}_{a3} a+(c0) a+(c1) a+(a0) a+(a1) a-(c2)