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The Champlain Sea lasted from about 13,000 years ago to about 10,000 years ago and was continuously shrinking during that time , a process that continues today .
 Champlain Sea
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Champlain Sea