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The three Stadtholders , Lambers , Van Gessel and De Witte tried to turn their provinces against the Union , but they were halted in their tracks by the mastermind behind the Union , Martin Drent .
 None
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