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