ContourPlot[(1/2-Sign[Cos[x^2]]/2)*(1/2-Sign[Cos[y^2]]/2),{x,-5,5},{y,-5,5}]ContourPlot[(1/2-Sign[Cos[x^2]]/2)*(1/2-Sign[Cos[y^2]]/2),{x,-5,5},{y,-5,5}]

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