974
At its embankment , the lake features a Slavic hill fort called Herthaburg , with a height of 17 m. It was constructed and inhabited between the 8th and 12th century .
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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:
 None