1/4 a^{c0,c1,a1}_{a0} b^{c2,c3,a3}_{a2} eta1^{a2}_{a1} gamma1^{a0}_{a3} a-(c3) a-(c2) a-(c1) a-(c0)
+1/4 a^{c0,c1,a1}_{a0} b^{c2,c3,a3}_{a2} lambda2^{a0,a2}_{a1,a3} a-(c3) a-(c2) a-(c1) a-(c0)
+1/4 a^{c0,c1,a2}_{a0} b^{c2,c3,a1}_{a3} eta1^{a3}_{a2} a+(a0) a-(a1) a-(c3) a-(c2) a-(c1) a-(c0)
-1/4 a^{c0,c1,a0}_{a2} b^{c2,c3,a3}_{a1} gamma1^{a2}_{a3} a+(a1) a-(a0) a-(c3) a-(c2) a-(c1) a-(c0)