Filtering Polylines by CLOSED or WIDTH

DWG is composed of multiple closed polylines forming rectangular shapes.  The length and width of the rectangular shapes vary.  Drawn down the center of each closed polyline is an open polyline with a width sufficient to fill the shape of the rectangle.  I'd like to remove these open polylines from the DWG.

I'm not a programmer so I'm looking for a solution that uses the menu or command line.  I tried using the filter command but I couldn't find a way to filter on closed or width parameters of polylines.

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