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Just exceeding the limit of the number of items you can carry in the 10-items-or-less section of the grocer or convenience store, symptoms include: mild distress and possible confusion. The only known cures are to either sacrifice an item to bring the number of items down to ten or to insist to the cashier that you only have ten items.
"Damn, that extra tube of toothpaste means elevenitis... but I can't sacrifice anything... NOOOOOOOOOOO!!!....."

"I'm telling you, there's only TEN items that I have... you're seeing wrong..... IT WAS A CONCEPTUAL ERROR!!!"
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