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The Atlantic Spruce tug was the first tug built with a Robert Allan Design , powered through twin Rolls Royce - Aquamaster ASD ( azimothing stern drive ) , with 4000 to 6000 bhp .
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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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