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Although Docker could not play yet , he already seemed to have an interest in music as can be seen on several photographs from that period which portray him with a variety of toy music instruments , such as an accordion , an electric guitar , a drum set and two Bontempi keyboards .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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