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2Significado: holehollow depression basin indentationcrater bowl recess cavity
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3Significado: valleydepth gulf pit shaftwell crater chasm abyss
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4Significado: channelhollow groove furrow dipcup crater trough
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5Significado: excavationpit hole hollow craterlode shaft quarry
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6Significado: thinghole cavity depression basin indentationcrater bowl recess hollow