-1/4 a^{c0,c1}_{c3,a0} b^{c2,a3}_{a1,a2} c^{c3}_{a4} eta1^{a4}_{a3} a+(a0) a+(a1) a+(a2) a-(c2) a-(c1) a-(c0)
+1/4 a^{c0,c1}_{c3,a0} b^{c3,a3}_{a1,a2} c^{c2}_{a4} eta1^{a4}_{a3} a+(a0) a+(a1) a+(a2) a-(c2) a-(c1) a-(c0)
-1/4 a^{c0,c1}_{c3,a3} b^{c2,a4}_{a0,a1} c^{c3}_{a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(c2) a-(c1) a-(c0)
+1/4 a^{c0,c1}_{c3,a3} b^{c3,a4}_{a0,a1} c^{c2}_{a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(c2) a-(c1) a-(c0)