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