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N h f

N h fN h fN h fN h fN h fN h f
N h fN h fN h fN h fN h fN h f
N h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h fN h f