What is the shortest book ever written?
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Books are used in education.
The book can be used for educational purposes .
What is the shortest book ever written?</s>Books are used in [unused1]education                [unused2] .
What is the shortest book ever written?</s>Books are used in education.
What is the shortest book ever written?</s>The book can be used for [unused1]education                [unused2] al purposes .
What is the shortest book ever written?</s>The book can be used for educational purposes .
What is the shortest book ever written?</s>[unused1]education[unused2],0,[unused1]education[unused2],[unused1]education[unused2],0,book,book,has use,[unused1]education[unused2],book,0,book
What is the shortest book ever written?</s>education,0,education,education,0,book,book,has use,education,book,0,book