In this May 22, 2015 file photo, artist Meg Saligman shows knots tied to a mock-up of an art installation at her studio in Philadelphia. The installation is planned to be in the shape of a latticed grotto and will greet Pope Francis and millions of others when they travel to Philadelphia this fall. Visitors will be invited to leave their own problems behind in the form of knots affixed to its walls, or help others by loosening and removing a knot already in place. (AP Photo/Matt Slocum/File)
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