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In 1804 he ended his use of the Lasswade cottage and leased the substantial house of Ashestiel , from Selkirk , was sited on the south bank of the River Tweed and incorporating an ancient tower house .
 Lasswade, Ashestiel, Selkirk, River Tweed
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lasswade, Ashestiel, Selkirk, River Tweed