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[–] Greasy 6 points -6 points (+0|-6) ago 

Maybe the marks are streaks of fingernail residue, not indentations in the concrete?

[–] [deleted] 0 points 1 point (+1|-0) ago 

[Deleted]

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[–] Greasy 1 point -1 points (+0|-1) ago 

OK, now I'm convinced. Thanks for setting me straight.