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The Eucharist may sometimes be celebrated in the form known as High Mass , with a priest , deacon and subdeacon ( usually actually a layperson ) dressed in traditional vestments , with incense and sanctus bells and prayers adapted from the Roman Missal or other sources by the celebrant .
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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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