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The siege of Arai was among the first steps taken by Hōjō Sōun towards becoming one of the most powerful warlords of Japan 's Sengoku period .
 Hōjō Sōun
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hōjō Sōun