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A " vigil " , from the Latin " vigilia " meaning " wakefulness " ( Greek : " pannychis " , or " agrypnia " ) , is a period of purposeful sleeplessness , an occasion for devotional watching , or an observance .
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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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