1/8 a^{}_{a0} b^{}_{c0,c1,c2,c3} c^{c2,c3}_{a1,a2} a+(c0) a+(c1) a+(a0) a+(a1) a+(a2)
-1/12 a^{}_{a0} b^{}_{c0,c1,c2,c4} c^{c3,c4}_{a1,a2} a+(c0) a+(c1) a+(c2) a+(a0) a+(a1) a+(a2) a-(c3)