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This article covers the powers of territorial police forces only but a constable in one of the UK 's special police forces ( most often a member of the British Transport Police ) gains those powers while he/she is on loan to a territorial force or discovers an incident which is otherwise outside his/her statutory jurisdiction .
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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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