315987
The lake system 's level has been controlled since 1945 when the level was raised by 6 dm ( 2 ft ) to 102.1 m ( 335 ft ) above sea level .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None