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. 2019 Feb 22;14(2):e0212610. doi: 10.1371/journal.pone.0212610

Fig 4. Balls dry and collecting dust near a short chain and a chain reaching to floor level.

Fig 4

The short chain is hanging too high and rusty, and the metal slats are shining, indicating intensive use of the part of the chain that is resting on the floor.