-1/4 a^{}_{} b^{a0,a1}_{c0,a2} c^{a4,a5}_{c1,a3} lambda2^{a2,a3}_{a4,a5} a+(c0) a+(c1) a-(a1) a-(a0)
+a^{}_{} b^{a0,a3}_{c0,a2} c^{a1,a5}_{c1,a4} eta1^{a4}_{a3} gamma1^{a2}_{a5} a+(c0) a+(c1) a-(a1) a-(a0)
+a^{}_{} b^{a0,a3}_{c0,a2} c^{a1,a5}_{c1,a4} lambda2^{a2,a4}_{a3,a5} a+(c0) a+(c1) a-(a1) a-(a0)
-1/4 a^{}_{} b^{a3,a4}_{c0,a2} c^{a0,a1}_{c1,a5} lambda2^{a2,a5}_{a3,a4} a+(c0) a+(c1) a-(a1) a-(a0)