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In 1797 , he was sent to Canada and employed until the end of 1800 in the construction of fortifications at St Joseph Island , Lake Huron , and then cut a new canal at the Cascades on the Saint Lawrence River .
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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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