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Limerick born Dr. Thomas Mackern of Blackheath , South East London , visited the West Indies in 1866 , to preach the gospel and to promote the literature work of the Plymouth Brethren in the islands .
 Limerick
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Limerick