[GENERAL] function for longest common substring?

[Ben]

Does anybody have a stored proc they'd like to share that computes the 
longest common substring for a set of strings? Wikipedia defines the 
problem nicely:

http://en.wikipedia.org/wiki/Longest_common_substring_problem
Basically, given "abcba" and "abdba", the algorithm should return "ab" and 
"ba" as equally valid answers.

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