1/8 a^{a1}_{a0} b^{a2,a3}_{c2,c3} c^{c2,c3}_{c0,c1} a+(c0) a+(c1) a+(a0) a-(a3) a-(a2) a-(a1)
+1/2 a^{a0}_{a2} b^{a1,a3}_{c0,c4} c^{c3,c4}_{c1,c2} gamma1^{a2}_{a3} a+(c0) a+(c1) a+(c2) a-(a1) a-(a0) a-(c3)
+1/4 a^{a0}_{a2} b^{a1,a3}_{c2,c3} c^{c2,c3}_{c0,c1} gamma1^{a2}_{a3} a+(c0) a+(c1) a-(a1) a-(a0)