1/4 a^{}_{c0,c1,a0,a1} b^{c4,a2}_{c2,c3} gamma1^{a1}_{a2} a+(c0) a+(c1) a+(c2) a+(c3) a+(a0) a-(c4)
-1/4 a^{}_{c0,c3,a0,a1} b^{c3,a2}_{c1,c2} a+(c0) a+(c1) a+(c2) a+(a0) a+(a1) a-(a2)
-1/2 a^{}_{c0,c3,a0,a1} b^{c3,a2}_{c1,c2} gamma1^{a1}_{a2} a+(c0) a+(c1) a+(c2) a+(a0)