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