question: As of 2021, how many books are in the Stormlight Archive series by Brandon Sanderson?
answerText: 4
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questionEntity.label: The Stormlight Archive
questionEntity.mention: Stormlight Archive
questionEntity.name: Q457608
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questionEntity.label: Brandon Sanderson
questionEntity.mention: Brandon Sanderson
questionEntity.name: 2021
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questionEntity.mention: 2021
answerEntity.name: Q2136877
answerEntity.label: The Way of Kings
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answerEntity.label: Words of Radiance
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answerEntity.label: Oathbringer
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answerEntity.label: Rhythm of War