n-Prefix–suffix languages∗
Masami Itō, Helmut Jürgensen, H. J. Shyr, G. Thierrin · International Journal of Computer Mathematics · 1989
The combinatorial structure of n-prefix-suffix languages, called n-ps-codes in this paper, is investigated. An n-ps-code is a language, each of whose subsets of cardinality at most n is a prefix code or a suffix code.