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There is no longer a barrier to fish at the weir near Grafhorst - designed to raise the water level during summer droughts - since it has been given a fish ladder .
 location: Grafhorst
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Grafhorst