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  1. The superposition of all instances of mapping between the set of all stations. This can be drawn as a diagram, or held in the neural structure of one's own brain.
  2. The transport network (usually tube, but possibly bus, rail, tram etc.) upon which the board is based.

These two usages should not be confused.

[Darren] [Dx]

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Last edited March 29, 2007 7:51 pm by Simons Mith (diff)