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Though a number of Wiccan traditions may practice a variation of the ritual , the modern form likely originated in Gardnerian Wicca , and is considered a central element of Gardnerian and Alexandrian Wiccan ceremonies .
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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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