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William Moore Wallis Clark ( January 10 , 1897 – May 1 , 1971 ) was an Ulster Unionist member of the Senate of Northern Ireland from 1946 until 1961 .
 Moore Wallis Clark, Ulster Unionist
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Moore Wallis Clark, Ulster Unionist