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In 1968 , they were signed by Elektra Records after the company 's president Jac Holzman saw them perform .
 Elektra Records, Jac Holzman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Elektra Records, Jac Holzman