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T Ursae Minoris is another red giant variable star that has undergone a dramatic change in status - from being a long period ( Mira ) variable ranging from magnitude 7.8 to 15 over 310 – 315 days to a semiregular variable .
 T Ursae Minoris
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 T Ursae Minoris