-1/4 a^{c0,c1}_{c4,a2} b^{c2,a3}_{a0,a1} c^{c4}_{c3} gamma1^{a2}_{a3} a+(c3) a+(a0) a+(a1) a-(c2) a-(c1) a-(c0)
+1/4 a^{c0,c1}_{c4,a2} b^{c4,a3}_{a0,a1} c^{c3}_{c2} gamma1^{a2}_{a3} a+(c2) a+(a0) a+(a1) a-(c3) a-(c1) a-(c0)