1/2 a^{}_{c0,a0,a1} b^{c3,a2}_{c1,c2} gamma1^{a1}_{a2} a+(c0) a+(c1) a+(c2) a+(a0) a-(c3)
-1/4 a^{}_{c2,a0,a1} b^{c2,a2}_{c0,c1} a+(c0) a+(c1) a+(a0) a+(a1) a-(a2)
-1/2 a^{}_{c2,a0,a1} b^{c2,a2}_{c0,c1} gamma1^{a1}_{a2} a+(c0) a+(c1) a+(a0)