I know that many plain and precious things are believed by LDS to have been lost from the Bible prior to the establishment of your church. Since D&C/Pearl of Great Price are regarded as new revelations and/or supplemental historical material, then what plain and precious things were restored within the Book of Mormon if it does contain the fullness of the gospel?
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VERY GOOD QUESTION!
It MUST contain it; for this big statue in Temple Square declares it so!!