* Longest common subsequence - https://en.wikipedia.org/wiki/Longest_common_subsequence
  * Longest common substring - https://en.wikipedia.org/wiki/Longest_common_substring
  * Generalized suffix tree - https://en.wikipedia.org/wiki/Generalized_suffix_tree
  * suffix tree
  * Third normal form - https://en.wikipedia.org/wiki/Third_normal_form
  * Boyce–Codd normal form - https://en.wikipedia.org/wiki/Boyce%E2%80%93Codd_normal_form