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The new engines were operational by 1782 and saved almost £ 11,000 a year on coal , though the mine had to agree to Boulton and Watt 's standard terms which included payment of an annual charge ( known as " dues " ) of one third of the fuel saved .
 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