A lot of things were added to Mark in the later years. Finding earlier fragments will surely clear up a lot of things.
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A lot of things were added to all NT writings in the mid 4th century, by Eusebius, to please Constantine.
Manuscript copies of the Hebrew original writings of all of the gospels have been located in Vatican archives, in what is known as the “junk box.”
They will become available soon. They are linked online, but are not well identified by the titles used by the librarians.
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