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Jul 12, 2019 at 1:01 vote accept uhoh
Dec 9, 2021 at 9:19
Apr 18, 2019 at 2:13 comment added uhoh Thank you for your answer! As you mention, "it is hard to prove a negative" so in cases like these it may be necessary to fall back on "expert testimony".
Apr 18, 2019 at 1:53 history answered Bill Gray CC BY-SA 4.0