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Thames and Severn Canal tunnel The Thames and Severn Canal Sapperton tunnel was the longest tunnel in Britain between 1789 and 1811 , and remains the fourth longest canal tunnel after Standedge , Yorkshire ; Strood , Kent ; and the Lapal Tunnel near Halesowen .
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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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