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In 1967 , he formed the rock band Elf , which became a regular opening act for Deep Purple .
 organization: Elf; organization: Deep Purple
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:
 organization: Elf; organization: Deep Purple