This image provided by Brown University shows the preface page of the "Mystery Book" from the John Carter Brown Library in Providence, R.I. Lucas Mason-Brown, a senior mathematics major at Brown University, helped crack a mysterious shorthand code developed and used by religious dissident Roger Williams in the 17th century. The handwritten code surrounds the printed text on the preface page. (AP Photo/John Carter Brown Library at Brown University)

Associated Press
This image provided by Brown University shows the preface page of the "Mystery Book" from the John Carter Brown Library in Providence, R.I. Lucas Mason-Brown, a senior mathematics major at Brown University, helped crack a mysterious shorthand code developed and used by religious dissident Roger Williams in the 17th century. The handwritten code surrounds the printed text on the preface page. (AP Photo/John Carter Brown Library at Brown University)
This image provided by Brown University shows the preface page of the "Mystery Book" from the John Carter Brown Library in Providence, R.I. Lucas Mason-Brown, a senior mathematics major at Brown University, helped crack a mysterious shorthand code developed and used by religious dissident Roger Williams in the 17th century. The handwritten code surrounds the printed text on the preface page. (AP Photo/John Carter Brown Library at Brown University)
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