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Caithness , Sutherland and the Northern Isles have the densest concentrations , but there are a great many examples in the west of Scotland and the Hebrides .
 Caithness, Sutherland, Northern Isles, Scotland, Hebrides
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Caithness, Sutherland, Northern Isles, Scotland, Hebrides