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The dyeing of Easter eggs in different colours is commonplace , with colour being achieved through boiling the egg in natural substances ( such as , onion peel ( brown colour ) , oak or alder bark or walnut nutshell ( black ) , beet juice ( pink ) etc .
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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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