A reference string set including a group of strings is set. At least two specific tuples of substring triples is found inside the reference string set of strings. Each tuple is considered as a candidate for representing a related concept. Each concatenation of the substrings triples is an explicit member of the reference string set. Each middle substring of the substring triples is unequal to another middle substring within the substring triples found inside the reference string set. Each prefix substring is equal to all other prefix substrings within the substring triples found inside the reference string set. Each suffix substring is equal to all other suffix substrings within the substring triples found inside the reference string set. Either the prefix substring or the suffix substring is not empty.
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