Which is the longest book series?
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Discworld is a novel series, which is a subclass of book series.
Discworld is a novel series which is a subclass of the novel series .
Which is the longest book series?</s> [unused1]Discworld                [unused2] is a novel series, which is a subclass of book series.
Which is the longest book series?</s>Discworld is a novel series, which is a subclass of book series.
Which is the longest book series?</s> [unused1]Discworld                [unused2] is a novel series which is a subclass of the novel series .
Which is the longest book series?</s>Discworld is a novel series which is a subclass of the novel series .
Which is the longest book series?</s>book series,0,book series,book series,0,novel series,book series,0,[unused1]Discworld[unused2],novel series,subclass of,book series,novel series,0,novel series,novel series,0,[unused1]Discworld[unused2],[unused1]Discworld[unused2],0,book series,[unused1]Discworld[unused2],instance of,novel series,[unused1]Discworld[unused2],0,[unused1]Discworld[unused2]
Which is the longest book series?</s>book series,0,book series,book series,0,novel series,book series,0,Discworld,novel series,subclass of,book series,novel series,0,novel series,novel series,0,Discworld,Discworld,0,book series,Discworld,instance of,novel series,Discworld,0,Discworld