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In western Cameroon is an irregular chain of mountains , hills , and plateaus that extends from Mount Cameroon almost to Lake Chad at the northern tip of the country .
 Cameroon, Mount Cameroon, Lake Chad
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cameroon, Mount Cameroon, Lake Chad