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Attending St. Omer with him was his cousin Charles Carroll of Carrollton , who was to become the only Catholic signer of the Declaration of Independence and the first United States Senator from Maryland .
 St. Omer, Charles Carroll of Carrollton, United States, Maryland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 St. Omer, Charles Carroll of Carrollton, United States, Maryland