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He joined his father ( Yehuda Ashlag , author of the Sulam commentary on The Book of Zohar ) on his trips , did his father 's errands , and provided for his father 's every need .
 Yehuda Ashlag
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yehuda Ashlag