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:: The extra step in the Luhn algorithm -- "if the product of this doubling operation is greater than 9 (e.g., 8 × 2 = 16), then sum the digits of the product" -- allows the Luhn algorithm to detect *any* single-digit transcription error.
:: How can we make this more obvious to people reading this article, without getting bogged down in unnecessary detail? --[[User:DavidCary|DavidCary]] ([[User talk:DavidCary|talk]]) 15:58, 22 December 2015 (UTC)
::: How about we just say that after the doubling step you add up all the digits modulo 10? Or perhaps say you add up, discarding all but the last digit along the way? [[User:Xcbsmith|Xcbsmith]] ([[User talk:Xcbsmith|talk]]) 02:05, 6 October 2016 (UTC)
=== Strengths/Weaknesses ===
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