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His second season saw him go one better when he won the domestic treble , with the help of players such as Ronald de Boer and Barry Ferguson .
 person: Ronald de Boer; person: Barry Ferguson
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:
 person: Ronald de Boer; person: Barry Ferguson