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W. P.: " sparkling Water in a blue Bottle "
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W. P.: " Tea "
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W. P.: " glass - factory "
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W. P.: " round and round "
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W. P.: " Shadows "
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W. P.: " a Drop of Water "
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W. P.: " Greenhouse "
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W. P.: " Wind "
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W. P.: " Fern cultivated in the Glas "
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W. P.: " Railway Track "
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W. P.: " natural painting in green "
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W. P.: " Hot stuff "
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W. P.: " On another planet "