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There is a page named "File:Sandpile Matemateca 03.jpg" on Wikipedia
Commons Attribution-Share Alike 4.0 International license. Attribution: Matemateca (IME USP) / (name of the photographer) You are free: to share – to copy...(2,800 × 2,800 (1.92 MB)) - 14:39, 13 April 2023
Commons Attribution-Share Alike 4.0 International license. Attribution: Matemateca (IME USP) / (name of the photographer) You are free: to share – to copy...(5,985 × 3,990 (13.77 MB)) - 14:39, 13 April 2023
