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A recent preprint arXiv:1807.08572 reported the observation of a transitionin Ag/Au nanoparticle composites near room temperature and at ambient pressure,to a vanishingly small four-probe resistance, which was tentatively identifiedas a percolating superconducting transition. In this brief comment, I point outthat a vanishing four-probe resistance may also emerge in non-superconductingsystems near conductance percolation threshold.

Comment on arXiv:1807.08572, "Coexistence of Diamagnetism and  Vanishingly Small Electrical Resistance at Ambient Temperature and Pressure  in Nanostructures"