1/864 a^{a0,a1,a2}_{a6} b^{}_{c0,c1,c2,c3} c^{a3,a4,a5,a7}_{} gamma1^{a6}_{a7} a+(c0) a+(c1) a+(c2) a+(c3) a-(a5) a-(a4) a-(a3) a-(a2) a-(a1) a-(a0)