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