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Pipe diameters do not change at every block in a distribution system. For example, one does not find a 300 mm pipe from First St. to Second St., a 150 mm pipe from Second St. to Third St., etc. In Wadiso it is possible to combine links in the model into a single group. For example, treating the pipe from First St. to Tenth St. as a single pipe (called a “group” in Wadiso) instead of as nine pipes greatly reduces the number of combinations of solutions.