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Character history At the start of the series , Tyrol is romantically involved with Lieutenant Sharon " Boomer " Valerii aboard Galactica , who is , unbeknownst to either Tyrol or herself , a Cylon .
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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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