Bouzouki the "tetrachordo" ("four-course") has four pairs of strings. The name "bouzouki" comes from the Turkish word "bozuk", meaning "broken" or "modified", and comes from a particular re-entrant tuning called "bozuk düzen", which was commonly used on its Turkish counterpart, the "saz-bozuk". It is in the same instrumental family as the mandolin and the lute. Originally the body was carved from a solid block of wood, similar to the saz, but upon its arrival in Greece in the early 1910s it was modified by the addition of a staved back borrowed from the Neapolitan mandola, and the top angled in the
Shannon capacity of a graph eight neighbors, the eight strings that it can be confused with. A subset of length-two strings forms a code with no possible confusion if and only if it corresponds to an independent set of this graph. The set of code words {"11", "23", "35", "54", "42"} forms one of these independent sets, of maximum size. If "G" is a graph representing the signals and confusable pairs of a channel, then the graph representing the length-two codewords and their confusable pairs is "G" ⊠ "G", where the symbol "⊠" represents the strong product of graphs. This is a graph that has