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Lake Chad , after which the country is named ( and which in turn takes its name from the Kanuri word for " lake " ) , is the remains of an immense lake that occupied of the Chad Basin 7,000 years ago .
 Lake Chad, Chad Basin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lake Chad, Chad Basin