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j1 = 0.9 j3 = 0.9 j4 = 0.1 jz = 0.5 d1 = 0.1 d2 = 0.1 z = 4 r1 = 1/2 (Cos[x] + Cos[y]) r2 = Cos[x]*Cos[y] a = 2*(j1 - j2 + j2*r2 - j1*r1)*z*sa + d1*(2*sa - 1) + jz*sb b = 2*(j3 - j4 +...