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In page Pre-Columbian trans-oceanic contact theories:

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As for the Decalogue Stone, there are mistakes that suggest it was carved by one or more novices who overlooked or misunderstood some details on a source Decalogue from which they copied it. Since there is absolutely no other evidence or archeological context in the vicinity, it is most likely that the legend at the nearby university is true—that the stone was carved by two anthropology students whose signatures can be seen inscribed in the rock below the Decalogue, "Eva and Hobe 3-13-30."[3]