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However his stay at Saltergate lasted only four months , making 16 appearances in total before joining Derby County in January 1956 for a fee of £1,500 .
 organization: Saltergate; organization: Derby County
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: Saltergate, Derby County 
Answer:
 organization: Saltergate; organization: Derby County