input: Please answer the following: which subclass of information filtering system was work of John Thomas Riedl
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output: A recommender system

input: Please answer the following: John Carroll Power served as the first custodian of a tomb of a president and how many of his sons ?
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output: three of their four sons

input: Please answer the following: Who is older, Li Yang or Ivan Passer?
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output: Ivan Passer

input: Please answer the following: In what year was the writer of "Anne of the Island" born?
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output:
1874