A function to find the longest shared substring in a character vector.
The character vector to process.
Optionally, two single values can be specified. This is probably not useful to end users, but it's used by the function when it calls itself.
A vector of length one with either the longest substring that occurs in all values of the character vector, or NA if no overlap an be found.
Maintainer: Gjalt-Jorn Peters <firstname.lastname@example.org>
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