Usage examples for unknown
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326; cause of it unknown, ii. – Rousseau Volumes I. and II. by John Morley
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That is indeed true; but I find no hint of who this unknown woman was. – A Life of St. John for the Young by George Ludington Weed
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" But," he answered earnestly, " unknown to myself her vision must always have been here." – Dross by Henry Seton Merriman