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In 1977 , fans erected a headstone in Swan Point Cemetery on which they inscribed his name , the dates of his birth and death , and the phrase " I AM PROVIDENCE " - a line from one of his personal letters .
 Swan Point Cemetery
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Swan Point Cemetery